T-SQLを使用したファジーマッチング
私はテーブルを持っていますPersons personaldataなどがあります。多数の列がありますが、ここで興味があるのは、addressindex、lastname、およびfirstnameです。ここで、addressindexは、アパート。したがって、「下に「好き」な人がlastnameとfirstnamesを持つ2人が同じ場合、それらは重複している可能性が高いです。
これらの重複をリストする方法が必要です。
tabledata:
personid 1
firstname "Carl"
lastname "Anderson"
addressindex 1
personid 2
firstname "Carl Peter"
lastname "Anderson"
addressindex 1
すべての列で正確に一致する場合、これをどのように行うか知っていますが、（上記の例から）次のような結果でトリックを行うにはファジーマッチが必要です：
Row personid addressindex lastname firstname
1 2 1 Anderson Carl Peter
2 1 1 Anderson Carl
.....
これを良い方法で解決する方法についてのヒントはありますか？
SQL Serverがファジーマッチングを行うために提供するものは、非常に不格好であることがわかりました。レーベンシュタイン距離アルゴリズムといくつかの重み付けを使用して、私自身のCLR関数で本当に幸運に恵まれました。そのアルゴリズムを使用して、GetSimilarityScoreというUDFを作成しました。このUDFは2つの文字列を受け取り、0.0〜1.0のスコアを返します。一致が1.0に近いほど優れています。次に、0.8以上のしきい値を使用してクエリを実行し、最も可能性の高い一致を取得します。このようなもの：
if object_id('tempdb..#similar') is not null drop table #similar
select a.id, (
select top 1 x.id
from MyTable x
where x.id <> a.id
order by dbo.GetSimilarityScore(a.MyField, x.MyField) desc
) as MostSimilarId
into #similar
from MyTable a
select *, dbo.GetSimilarityScore(a.MyField, c.MyField)
from MyTable a
join #similar b on a.id = b.id
join MyTable c on b.MostSimilarId = c.id
本当に大きなテーブルでそれをしないでください。遅いプロセスです。
CLR UDFは次のとおりです。
''' <summary>
''' Compute the distance between two strings.
''' </summary>
''' <param name="s1">The first of the two strings.</param>
''' <param name="s2">The second of the two strings.</param>
''' <returns>The Levenshtein cost.</returns>
<Microsoft.SqlServer.Server.SqlFunction()> _
Public Shared Function ComputeLevenstheinDistance(ByVal string1 As SqlString, ByVal string2 As SqlString) As SqlInt32
If string1.IsNull OrElse string2.IsNull Then Return SqlInt32.Null
Dim s1 As String = string1.Value
Dim s2 As String = string2.Value
Dim n As Integer = s1.Length
Dim m As Integer = s2.Length
Dim d As Integer(,) = New Integer(n, m) {}
' Step 1
If n = 0 Then Return m
If m = 0 Then Return n
' Step 2
For i As Integer = 0 To n
d(i, 0) = i
Next
For j As Integer = 0 To m
d(0, j) = j
Next
' Step 3
For i As Integer = 1 To n
'Step 4
For j As Integer = 1 To m
' Step 5
Dim cost As Integer = If((s2(j - 1) = s1(i - 1)), 0, 1)
' Step 6
d(i, j) = Math.Min(Math.Min(d(i - 1, j) + 1, d(i, j - 1) + 1), d(i - 1, j - 1) + cost)
Next
Next
' Step 7
Return d(n, m)
End Function
''' <summary>
''' Returns a score between 0.0-1.0 indicating how closely two strings match. 1.0 is a 100%
''' T-SQL equality match, and the score goes down from there towards 0.0 for less similar strings.
''' </summary>
<Microsoft.SqlServer.Server.SqlFunction()> _
Public Shared Function GetSimilarityScore(string1 As SqlString, string2 As SqlString) As SqlDouble
If string1.IsNull OrElse string2.IsNull Then Return SqlInt32.Null
Dim s1 As String = string1.Value.ToUpper().TrimEnd(" "c)
Dim s2 As String = string2.Value.ToUpper().TrimEnd(" "c)
If s1 = s2 Then Return 1.0F ' At this point, T-SQL would consider them the same, so I will too
Dim flatLevScore As Double = InternalGetSimilarityScore(s1, s2)
Dim letterS1 As String = GetLetterSimilarityString(s1)
Dim letterS2 As String = GetLetterSimilarityString(s2)
Dim letterScore As Double = InternalGetSimilarityScore(letterS1, letterS2)
'Dim wordS1 As String = GetWordSimilarityString(s1)
'Dim wordS2 As String = GetWordSimilarityString(s2)
'Dim wordScore As Double = InternalGetSimilarityScore(wordS1, wordS2)
If flatLevScore = 1.0F AndAlso letterScore = 1.0F Then Return 1.0F
If flatLevScore = 0.0F AndAlso letterScore = 0.0F Then Return 0.0F
' Return weighted result
Return (flatLevScore * 0.2F) + (letterScore * 0.8F)
End Function
Private Shared Function InternalGetSimilarityScore(s1 As String, s2 As String) As Double
Dim dist As SqlInt32 = ComputeLevenstheinDistance(s1, s2)
Dim maxLen As Integer = If(s1.Length > s2.Length, s1.Length, s2.Length)
If maxLen = 0 Then Return 1.0F
Return 1.0F - Convert.ToDouble(dist.Value) / Convert.ToDouble(maxLen)
End Function
''' <summary>
''' Sorts all the alpha numeric characters in the string in alphabetical order
''' and removes everything else.
''' </summary>
Private Shared Function GetLetterSimilarityString(s1 As String) As String
Dim allChars = If(s1, "").ToUpper().ToCharArray()
Array.Sort(allChars)
Dim result As New StringBuilder()
For Each ch As Char In allChars
If Char.IsLetterOrDigit(ch) Then
result.Append(ch)
End If
Next
Return result.ToString()
End Function
''' <summary>
''' Removes all non-alpha numeric characters and then sorts
''' the words in alphabetical order.
''' </summary>
Private Shared Function GetWordSimilarityString(s1 As String) As String
Dim words As New List(Of String)()
Dim curWord As StringBuilder = Nothing
For Each ch As Char In If(s1, "").ToUpper()
If Char.IsLetterOrDigit(ch) Then
If curWord Is Nothing Then
curWord = New StringBuilder()
End If
curWord.Append(ch)
Else
If curWord IsNot Nothing Then
words.Add(curWord.ToString())
curWord = Nothing
End If
End If
Next
If curWord IsNot Nothing Then
words.Add(curWord.ToString())
End If
words.Sort(StringComparer.OrdinalIgnoreCase)
Return String.Join(" ", words.ToArray())
End Function
ここでの他の良い情報に加えて、 Double Metaphone 音声アルゴリズムの使用を検討することをお勧めします。これは一般に [〜＃ 〜] soundex [〜＃〜] 。
Tim Pfeifferの記事でSQLの実装について詳しく説明しています Double Metaphone Sounds Great Convert C++ Double Metaphone algorithm to T-SQL （元々 SQL Mag ＆then SQL Server Pro ）。
これは、たとえばCarl vs. Karlのように、わずかなスペルミスのある名前のマッチングに役立ちます。
更新：実際のダウンロード可能なコードはなくなったようですが、 githubリポジトリにある実装があります 元のコードを複製したように見える
SQL Server Full Text Indexingを使用します。これにより、検索を実行し、Wordを含むだけでなくスペルミスの可能性のあるものを返すことができます。
Master Data Servicesの最初のリリース以来、SOUNDEXが実装しているものよりも高度なファジーロジックアルゴリズムにアクセスできます。 MDSがインストールされていれば、mdqでSimilarity（）という関数を見つけることができます。スキーマ（MDSデータベース）。
私は個人的に Jaro-Winkler アルゴリズムのCLR実装を使用していますが、これはかなりうまく機能しているようです-約15文字より長い文字列で少し苦労しており、電子メールアドレスの一致が好きではありませんが、それ以外はかなり良いです-完全な実装ガイドを見つけることができます こちら
何らかの理由でCLR関数を使用できない場合は、（ファジー変換ルックアップを使用して）SSISパッケージを介してデータを実行してみてください-詳細 ここ
重複除去に関しては、文字列の分割と一致は素晴らしい最初のカットです。ワークロードを削減したり、より良い結果を得るために活用できるデータに関する既知の項目がある場合、それらを活用することは常に良いことです。多くの場合、重複除外のために手作業を完全に排除することは不可能ですが、できる限り自動でキャッチし、「不確実なケース」のレポートを生成することで簡単にできます。
名前の一致に関して：SOUNDEXは一致の品質が恐ろしく、ターゲットから遠すぎるものに一致するため、あなたがやろうとしている仕事のタイプには特に悪いです。ダブルメタフォンの結果とレーベンシュタイン距離の組み合わせを使用して、名前の一致を実行することをお勧めします。適切なバイアスをかけると、これは非常にうまく機能し、おそらく既知のものをクリーンアップした後の2回目のパスに使用できます。
また、SSISパッケージを使用して、ファジールックアップおよびグループ化変換（http://msdn.Microsoft.com/en-us/library/ms345128(SQL.90).aspx）を検討することも検討できます。
SQLフルテキスト検索（http://msdn.Microsoft.com/en-us/library/cc879300.aspx）を使用することも可能ですが、特定の問題ドメインには適切ではない可能性があります。
リンクの腐敗を避けるために、2つの部分にRedFilterコードを貼り付ける
参照：
https://github.com/mb16/geocoderNet/blob/master/build/sql/doubleMetaphone.sqlPart1：
--WEB LISTING 1: Double Metaphone Script
-------------------------------------
IF OBJECT_ID('fnIsVowel') IS NOT NULL BEGIN DROP FUNCTION fnIsVowel END
GO;
CREATE FUNCTION fnIsVowel( @c char(1) )
RETURNS bit
AS
BEGIN
IF (@c = 'A') OR (@c = 'E') OR (@c = 'I') OR (@c = 'O') OR (@c = 'U') OR (@c = 'Y')
BEGIN
RETURN 1
END
--'ELSE' would worry SQL Server, it wants RETURN last in a scalar function
RETURN 0
END
GO;
-----------------------------------------------
IF OBJECT_ID('fnSlavoGermanic') IS NOT NULL BEGIN DROP FUNCTION fnSlavoGermanic
END
GO;
CREATE FUNCTION fnSlavoGermanic( @Word char(50) )
RETURNS bit
AS
BEGIN
--Catch NULL also...
IF (CHARINDEX('W',@Word) > 0) OR (CHARINDEX('K',@Word) > 0) OR
(CHARINDEX('CZ',@Word) > 0)
--'WITZ' test is in original Lawrence Philips C++ code, but appears to be a subset of the first test for 'W'
-- OR (CHARINDEX('WITZ',@Word) > 0)
BEGIN
RETURN 1
END
--ELSE
RETURN 0
END
GO;
---------------------------------------------------------------------------------------------------------------------------------
----------------------
--Lawrence Philips calls for a length argument, but this has two drawbacks:
--1. All target strings must be of the same length
--2. It presents an opportunity for subtle bugs, ie fnStringAt( 1, 7, 'Search me please', 'Search' ) returns 0 (no matter what is in the searched string)
--So I've eliminated the argument and fnStringAt checks the length of each target as it executes
--DEFAULTS suck with UDFs. Have to specify DEFAULT in caller - why bother?
IF OBJECT_ID('fnStringAtDef') IS NOT NULL BEGIN DROP FUNCTION fnStringAtDef END
GO;
CREATE FUNCTION fnStringAtDef( @Start int, @StringToSearch varchar(50),
@Target1 varchar(50),
@Target2 varchar(50) = NULL,
@Target3 varchar(50) = NULL,
@Target4 varchar(50) = NULL,
@Target5 varchar(50) = NULL,
@Target6 varchar(50) = NULL )
RETURNS bit
AS
BEGIN
IF CHARINDEX(@Target1,@StringToSearch,@Start) > 0 RETURN 1
--2 Styles, test each optional argument for NULL, nesting further tests
--or just take advantage of CHARINDEX behavior with a NULL arg (unless 65 compatibility - code check before CREATE FUNCTION?
--Style 1:
--IF @Target2 IS NOT NULL
--BEGIN
-- IF CHARINDEX(@Target2,@StringToSearch,@Start) > 0 RETURN 1
-- (etc.)
--END
--Style 2:
IF CHARINDEX(@Target2,@StringToSearch,@Start) > 0 RETURN 1
IF CHARINDEX(@Target3,@StringToSearch,@Start) > 0 RETURN 1
IF CHARINDEX(@Target4,@StringToSearch,@Start) > 0 RETURN 1
IF CHARINDEX(@Target5,@StringToSearch,@Start) > 0 RETURN 1
IF CHARINDEX(@Target6,@StringToSearch,@Start) > 0 RETURN 1
RETURN 0
END
GO;
-------------------------------------------------------------------------------------------------
IF OBJECT_ID('fnStringAt') IS NOT NULL BEGIN DROP FUNCTION fnStringAt END
GO;
CREATE FUNCTION fnStringAt( @Start int, @StringToSearch varchar(50), @TargetStrings
varchar(2000) )
RETURNS bit
AS
BEGIN
DECLARE @SingleTarget varchar(50)
DECLARE @CurrentStart int
DECLARE @CurrentLength int
--Eliminate special cases
--Trailing space is needed to check for end of Word in some cases, so always append comma
--loop tests should fairly quickly ignore ',,' termination
SET @TargetStrings = @TargetStrings + ','
SET @CurrentStart = 1
--Include terminating comma so spaces don't get truncated
SET @CurrentLength = (CHARINDEX(',',@TargetStrings,@CurrentStart) -
@CurrentStart) + 1
SET @SingleTarget = SUBSTRING(@TargetStrings,@CurrentStart,@CurrentLength)
WHILE LEN(@SingleTarget) > 1
BEGIN
IF SUBSTRING(@StringToSearch,@Start,LEN(@SingleTarget)-1) =
LEFT(@SingleTarget,LEN(@SingleTarget)-1)
BEGIN
RETURN 1
END
SET @CurrentStart = (@CurrentStart + @CurrentLength)
SET @CurrentLength = (CHARINDEX(',',@TargetStrings,@CurrentStart) -
@CurrentStart) + 1
IF NOT @CurrentLength > 1 --getting trailing comma
BEGIN
BREAK
END
SET @SingleTarget =
SUBSTRING(@TargetStrings,@CurrentStart,@CurrentLength)
END
RETURN 0
END
GO;
------------------------------------------------------------------------
IF OBJECT_ID('fnDoubleMetaphoneTable') IS NOT NULL BEGIN DROP FUNCTION
fnDoubleMetaphoneTable END
GO;
CREATE FUNCTION fnDoubleMetaphoneTable( @Word varchar(50) )
RETURNS @DMP TABLE ( Metaphone1 char(4), Metaphone2 char(4) )
AS
BEGIN
DECLARE @MP1 varchar(4), @MP2 varchar(4)
SET @MP1 = ''
SET @MP2 = ''
DECLARE @CurrentPosition int, @WordLength int, @CurrentChar char(1)
SET @CurrentPosition = 1
SET @WordLength = LEN(@Word)
IF @WordLength < 1
BEGIN
RETURN
END
--ensure case insensitivity
SET @Word = UPPER(@Word)
IF dbo.fnStringAt(1, @Word, 'GN,KN,PN,WR,PS') = 1
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
IF 'X' = LEFT(@Word,1)
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'S'
SET @CurrentPosition = @CurrentPosition + 1
END
WHILE (4 > LEN(RTRIM(@MP1))) OR (4 > LEN(RTRIM(@MP2)))
BEGIN
IF @CurrentPosition > @WordLength
BEGIN
BREAK
END
SET @CurrentChar = SUBSTRING(@Word,@CurrentPosition,1)
IF @CurrentChar IN('A','E','I','O','U','Y')
BEGIN
IF @CurrentPosition = 1
BEGIN
SET @MP1 = @MP1 + 'A'
SET @MP2 = @MP2 + 'A'
END
SET @CurrentPosition = @CurrentPosition + 1
END
ELSE IF @CurrentChar = 'B'
BEGIN
SET @MP1 = @MP1 + 'P'
SET @MP2 = @MP2 + 'P'
IF 'B' = SUBSTRING(@Word,@CurrentPosition + 1,1)
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
ELSE IF @CurrentChar = 'Ç'
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'S'
SET @CurrentPosition = @CurrentPosition + 1
END
ELSE IF @CurrentChar = 'C'
BEGIN
--various germanic
IF (@CurrentPosition > 2)
AND (dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition-2,1))=0)
AND (dbo.fnStringAt(@CurrentPosition-1,@Word,'ACH') = 1)
AND ((SUBSTRING(@Word,@CurrentPosition+2,1) <> 'I')
AND ((SUBSTRING(@Word,@CurrentPosition+2,1) <> 'E') OR
(dbo.fnStringAt(@CurrentPosition-2,@Word,'BACHER,MACHER')=1)))
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
SET @CurrentPosition = @CurrentPosition + 2
END
-- 'caesar'
ELSE IF (@CurrentPosition = 1) AND
(dbo.fnStringAt(@CurrentPosition,@Word,'CAESAR') = 1)
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'S'
SET @CurrentPosition = @CurrentPosition + 2
END
-- 'chianti'
ELSE IF dbo.fnStringAt(@CurrentPosition,@Word,'CHIA') = 1
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE IF dbo.fnStringAt(@CurrentPosition,@Word,'CH') = 1
BEGIN
-- Find 'michael'
IF (@CurrentPosition > 1) AND
(dbo.fnStringAt(@CurrentPosition,@Word,'CHAE') = 1)
BEGIN
--First instance of alternate encoding
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'X'
SET @CurrentPosition = @CurrentPosition + 2
END
--greek roots e.g. 'chemistry', 'chorus'
ELSE IF (@CurrentPosition = 1) AND (dbo.fnStringAt(2, @Word,
'HARAC,HARIS,HOR,HYM,HIA,HEM') = 1) AND (dbo.fnStringAt(1,@Word,'CHORE') = 0)
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
SET @CurrentPosition = @CurrentPosition + 2
END
--germanic, greek, or otherwise 'ch' for 'kh' sound
ELSE IF ((dbo.fnStringAt(1,@Word,'VAN ,VON ,SCH')=1) OR
(dbo.fnStringAt(@CurrentPosition-
2,@Word,'ORCHES,ARCHIT,ORCHID')=1) OR
(dbo.fnStringAt(@CurrentPosition+2,@Word,'T,S')=1) OR
(((dbo.fnStringAt(@CurrentPosition-1,@Word,'A,O,U,E')=1)
OR
(@CurrentPosition = 1))
AND
(dbo.fnStringAt(@CurrentPosition+2,@Word,'L,R,N,M,B,H,F,V,W, ')=1)))
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
--is this a given?
IF (@CurrentPosition > 1)
BEGIN
IF (dbo.fnStringAt(1,@Word,'MC') = 1)
BEGIN
--eg McHugh
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
END
ELSE
BEGIN
--Alternate encoding
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'K'
END
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'X'
END
SET @CurrentPosition = @CurrentPosition + 2
END
END
--e.g, 'czerny'
ELSE IF (dbo.fnStringAt(@CurrentPosition,@Word,'CZ')=1) AND
(dbo.fnStringAt((@CurrentPosition - 2),@Word,'WICZ')=0)
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'X'
SET @CurrentPosition = @CurrentPosition + 2
END
--e.g., 'focaccia'
ELSE IF(dbo.fnStringAt((@CurrentPosition + 1),@Word,'CIA')=1)
BEGIN
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'X'
SET @CurrentPosition = @CurrentPosition + 3
END
--double 'C', but not if e.g. 'McClellan'
ELSE IF(dbo.fnStringAt(@CurrentPosition,@Word,'CC')=1) AND NOT
((@CurrentPosition = 2) AND (LEFT(@Word,1) = 'M'))
--'bellocchio' but not 'bacchus'
IF (dbo.fnStringAt((@CurrentPosition + 2),@Word,'I,E,H')=1) AND
(dbo.fnStringAt((@CurrentPosition + 2),@Word,'HU')=0)
BEGIN
--'accident', 'accede' 'succeed'
IF (((@CurrentPosition = 2) AND
(SUBSTRING(@Word,@CurrentPosition - 1,1) = 'A'))
OR (dbo.fnStringAt((@CurrentPosition -
1),@Word,'UCCEE,UCCES')=1))
BEGIN
SET @MP1 = @MP1 + 'KS'
SET @MP2 = @MP2 + 'KS'
END
--'bacci', 'bertucci', other italian
ELSE
BEGIN
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'X'
END
SET @CurrentPosition = @CurrentPosition + 3
END
--Pierce's rule
ELSE
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE IF (dbo.fnStringAt(@CurrentPosition,@Word,'CK,CG,CQ')=1)
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE IF (dbo.fnStringAt(@CurrentPosition,@Word,'CI,CE,CY')=1)
BEGIN
--italian vs. english
IF (dbo.fnStringAt(@CurrentPosition,@Word,'CIO,CIE,CIA')=1)
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'X'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'S'
END
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
--name sent in 'mac caffrey', 'mac gregor
IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,' C, Q, G')=1)
BEGIN
SET @CurrentPosition = @CurrentPosition + 3
END
ELSE
BEGIN
IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,'C,K,Q')=1)
AND (dbo.fnStringAt((@CurrentPosition + 1), 2, 'CE,CI')=0)
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
END
END
ELSE IF @CurrentChar = 'D'
BEGIN
IF (dbo.fnStringAt(@CurrentPosition, @Word, 'DG')=1)
BEGIN
IF (dbo.fnStringAt((@CurrentPosition + 2),@Word,'I,E,Y')=1)
BEGIN
--e.g. 'Edge'
SET @MP1 = @MP1 + 'J'
SET @MP2 = @MP2 + 'J'
SET @CurrentPosition = @CurrentPosition + 3
END
ELSE
BEGIN
--e.g. 'edgar'
SET @MP1 = @MP1 + 'TK'
SET @MP2 = @MP2 + 'TK'
SET @CurrentPosition = @CurrentPosition + 2
END
END
ELSE IF (dbo.fnStringAt(@CurrentPosition,@Word,'DT,DD')=1)
BEGIN
SET @MP1 = @MP1 + 'T'
SET @MP2 = @MP2 + 'T'
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'T'
SET @MP2 = @MP2 + 'T'
SET @CurrentPosition = @CurrentPosition + 1
END
END
ELSE IF @CurrentChar = 'F'
BEGIN
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'F')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
SET @MP1 = @MP1 + 'F'
SET @MP2 = @MP2 + 'F'
END
ELSE IF @CurrentChar = 'G'
BEGIN
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'H')
BEGIN
IF (@CurrentPosition > 1) AND
(dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition - 1,1)) = 0)
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
SET @CurrentPosition = @CurrentPosition + 2
END
--'ghislane', ghiradelli
ELSE IF (@CurrentPosition = 1)
BEGIN
IF (SUBSTRING(@Word,@CurrentPosition + 2,1) = 'I')
BEGIN
SET @MP1 = @MP1 + 'J'
SET @MP2 = @MP2 + 'J'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
END
SET @CurrentPosition = @CurrentPosition + 2
END
--Parker's rule (with some further refinements) - e.g., 'hugh'
ELSE IF (((@CurrentPosition > 2) AND (dbo.fnStringAt((@CurrentPosition
- 2),@Word,'B,H,D')=1) )
--e.g., 'bough'
OR ((@CurrentPosition > 3) AND (dbo.fnStringAt((@CurrentPosition
- 3),@Word,'B,H,D')=1) )
--e.g., 'broughton'
OR ((@CurrentPosition > 4) AND (dbo.fnStringAt((@CurrentPosition
- 4),@Word,'B,H')=1) ) )
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
--e.g., 'laugh', 'McLaughlin', 'cough', 'gough', 'rough', 'tough'
IF ((@CurrentPosition > 3)
AND (SUBSTRING(@Word,@CurrentPosition - 1,1) = 'U')
AND (dbo.fnStringAt((@CurrentPosition -
3),@Word,'C,G,L,R,T')=1) )
BEGIN
SET @MP1 = @MP1 + 'F'
SET @MP2 = @MP2 + 'F'
END
ELSE
BEGIN
IF ((@CurrentPosition > 1) AND
SUBSTRING(@Word,@CurrentPosition - 1,1) <> 'I')
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
END
END
SET @CurrentPosition = @CurrentPosition + 2
END
END
ELSE IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'N')
BEGIN
IF ((@CurrentPosition = 2) AND (dbo.fnIsVowel(LEFT(@Word,1))=1) AND
(dbo.fnSlavoGermanic(@Word)=0))
BEGIN
SET @MP1 = @MP1 + 'KN'
SET @MP2 = @MP2 + 'N'
END
ELSE
BEGIN
--not e.g. 'cagney'
IF ((dbo.fnStringAt((@CurrentPosition + 2),@Word,'EY')=0)
AND (SUBSTRING(@Word,@CurrentPosition + 1,1) <>
'Y') AND (dbo.fnSlavoGermanic(@Word)=0))
コードのパート2 Redfilterのリンクの場合回答：
参照：
https://github.com/mb16/geocoderNet/blob/master/build/sql/doubleMetaphone.sql
BEGIN
SET @MP1 = @MP1 + 'N'
SET @MP2 = @MP2 + 'KN'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'KN'
SET @MP2 = @MP2 + 'KN'
END
END
SET @CurrentPosition = @CurrentPosition + 2
END
--'tagliaro'
ELSE IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,'LI')=1) AND
(dbo.fnSlavoGermanic(@Word)=0)
BEGIN
SET @MP1 = @MP1 + 'KL'
SET @MP2 = @MP2 + 'L'
SET @CurrentPosition = @CurrentPosition + 2
END
-- -ges-,-gep-,-gel-, -gie- at beginning
-- This call to fnStringAt() is the 'worst case' in number of values passed. A UDF that used DEFAULT values instead of
-- a multi-valued argument would require ten DEFAULT arguments for EP, EB, EL, etc. (assuming the first was not defined with a DEFAULT).
ELSE IF ((@CurrentPosition = 1)
AND ((SUBSTRING(@Word,@CurrentPosition + 1,1) = 'Y')
OR (dbo.fnStringAt((@CurrentPosition +
1),@Word,'ES,EP,EB,EL,EY,IB,IL,IN,IE,EI,ER')=1)) )
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'J'
SET @CurrentPosition = @CurrentPosition + 2
END
-- -ger-, -gy-
ELSE IF (((dbo.fnStringAt((@CurrentPosition + 1), @Word, 'ER')=1) OR
(SUBSTRING(@Word,@CurrentPosition + 1,1) = 'Y'))
AND (dbo.fnStringAt(1, @Word, 'DANGER,RANGER,MANGER')=0)
AND (dbo.fnStringAt((@CurrentPosition - 1), @Word,
'E,I,RGY,OGY')=0) )
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'J'
SET @CurrentPosition = @CurrentPosition + 2
END
-- italian e.g, 'biaggi'
ELSE IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,'E,I,Y')=1) OR
(dbo.fnStringAt((@CurrentPosition - 1),@Word,'AGGI,OGGI')=1)
BEGIN
--obvious germanic
IF ((dbo.fnStringAt(1,@Word,'VAN ,VON ,SCH')=1)
OR (dbo.fnStringAt((@CurrentPosition + 1),@Word,'ET')=1))
BEGIN
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
END
ELSE
BEGIN
--always soft if french ending
IF (dbo.fnStringAt((@CurrentPosition + 1),@Word,'IER ')=1)
BEGIN
SET @MP1 = @MP1 + 'J'
SET @MP2 = @MP2 + 'J'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'J'
SET @MP2 = @MP2 + 'K'
END
END
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'G')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
END
END
ELSE IF @CurrentChar = 'H'
BEGIN
--only keep if first & before vowel or btw. 2 vowels
IF (((@CurrentPosition = 1) OR
(dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition - 1,1))=1))
AND (dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition + 1,1))=1))
BEGIN
SET @MP1 = @MP1 + 'H'
SET @MP2 = @MP2 + 'H'
SET @CurrentPosition = @CurrentPosition + 2
END
--also takes care of 'HH'
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
ELSE IF @CurrentChar = 'J'
BEGIN
--obvious spanish, 'jose', 'san jacinto'
IF (dbo.fnStringAt(@CurrentPosition,@Word,'JOSE')=1) OR
(dbo.fnStringAt(1,@Word,'SAN ')=1)
BEGIN
IF (((@CurrentPosition = 1) AND (SUBSTRING(@Word,@CurrentPosition
+ 4,1) = ' ')) OR (dbo.fnStringAt(1,@Word,'SAN ')=1) )
BEGIN
SET @MP1 = @MP1 + 'H'
SET @MP2 = @MP2 + 'H'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'J'
SET @MP2 = @MP2 + 'H'
END
SET @CurrentPosition = @CurrentPosition + 1
END
ELSE IF ((@CurrentPosition = 1) AND
(dbo.fnStringAt(@CurrentPosition,@Word,'JOSE')=0))
BEGIN
SET @MP1 = @MP1 + 'J'
--Yankelovich/Jankelowicz
SET @MP2 = @MP2 + 'A'
--it could happen!
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'J')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
ELSE
BEGIN
--spanish pron. of e.g. 'bajador'
IF( (dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition - 1,1))=1)
AND (dbo.fnSlavoGermanic(@Word)=0)
AND ((SUBSTRING(@Word,@CurrentPosition + 1,1) = 'A') OR
(SUBSTRING(@Word,@CurrentPosition + 1,1) = 'O')))
BEGIN
SET @MP1 = @MP1 + 'J'
SET @MP2 = @MP2 + 'H'
END
ELSE
BEGIN
IF (@CurrentPosition = @WordLength)
BEGIN
SET @MP1 = @MP1 + 'J'
SET @MP2 = @MP2 + ''
END
ELSE
BEGIN
IF ((dbo.fnStringAt((@CurrentPosition + 1), @Word,
'L,T,K,S,N,M,B,Z')=0)
AND (dbo.fnStringAt((@CurrentPosition - 1), @Word,
'S,K,L')=0))
BEGIN
SET @MP1 = @MP1 + 'J'
SET @MP2 = @MP2 + 'J'
END
END
END
--it could happen!
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'J')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
END
ELSE IF @CurrentChar = 'K'
BEGIN
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'K')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
END
ELSE IF @CurrentChar = 'L'
BEGIN
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'L')
BEGIN
--spanish e.g. 'cabrillo', 'gallegos'
IF (((@CurrentPosition = (@WordLength - 3))
AND (dbo.fnStringAt((@CurrentPosition -
1),@Word,'ILLO,ILLA,ALLE')=1))
OR (((dbo.fnStringAt((@WordLength - 1),@Word,'AS,OS')=1)
OR (dbo.fnStringAt(@WordLength,@Word,'A,O')=1))
AND (dbo.fnStringAt((@CurrentPosition -
1),@Word,'ALLE')=1)) )
BEGIN
SET @MP1 = @MP1 + 'L'
SET @MP2 = @MP2 + ''
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
SET @MP1 = @MP1 + 'L'
SET @MP2 = @MP2 + 'L'
END
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
SET @MP1 = @MP1 + 'L'
SET @MP2 = @MP2 + 'L'
END
END
ELSE IF @CurrentChar = 'M'
BEGIN
--'dumb','thumb'
IF (((dbo.fnStringAt((@CurrentPosition - 1), @Word,'UMB')=1)
AND (((@CurrentPosition + 1) = @WordLength) OR
(dbo.fnStringAt((@CurrentPosition + 2),@Word,'ER')=1)))
OR (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'M') )
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
SET @MP1 = @MP1 + 'M'
SET @MP2 = @MP2 + 'M'
END
ELSE IF @CurrentChar = 'N'
BEGIN
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'N')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
SET @MP1 = @MP1 + 'N'
SET @MP2 = @MP2 + 'N'
END
ELSE IF @CurrentChar = 'Ñ'
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
SET @MP1 = @MP1 + 'N'
SET @MP2 = @MP2 + 'N'
END
ELSE IF @CurrentChar = 'P'
BEGIN
--What about Michelle Pfeiffer, star of Grease 2? Price-Pfister?, Pfizer?
--Don't just look for an 'F' next, what about 'topflight', helpful, campfire, leapfrog, stepfather
--Sorry, Mark Knopfler, I don't know how to help you
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'H')
OR ((@CurrentPosition = 1) AND
(SUBSTRING(@Word,@CurrentPosition + 1,1) = 'F') AND
(dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition+2,1))=1))
BEGIN
SET @MP1 = @MP1 + 'F'
SET @MP2 = @MP2 + 'F'
SET @CurrentPosition = @CurrentPosition + 2
END
--also account for "campbell", "raspberry"
ELSE
BEGIN
IF (dbo.fnStringAt((@CurrentPosition + 1),@Word, 'P,B')=1)
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
SET @MP1 = @MP1 + 'P'
SET @MP2 = @MP2 + 'P'
END
END
ELSE IF @CurrentChar = 'Q'
BEGIN
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'Q')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
SET @MP1 = @MP1 + 'K'
SET @MP2 = @MP2 + 'K'
END
ELSE IF @CurrentChar = 'R'
BEGIN
--QQ: Will SQL short circuit eval? Otherwise, I could try to read before string begins here...
--french e.g. 'rogier', but exclude 'hochmeier'
IF ((@CurrentPosition = @WordLength)
AND (dbo.fnSlavoGermanic(@Word)=0)
AND (dbo.fnStringAt((@CurrentPosition - 2), @Word, 'IE')=1)
AND (dbo.fnStringAt((@CurrentPosition - 4), @Word,
'ME,MA')=0))
BEGIN
SET @MP1 = @MP1 + ''
SET @MP2 = @MP2 + 'R'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'R'
SET @MP2 = @MP2 + 'R'
END
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'R')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
ELSE IF @CurrentChar = 'S'
BEGIN
--special cases 'island', 'isle', 'carlisle', 'carlysle'
IF (dbo.fnStringAt((@CurrentPosition - 1), @Word, 'ISL,YSL')=1)
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
--special case 'sugar-'
ELSE IF ((@CurrentPosition = 1) AND (dbo.fnStringAt(@CurrentPosition,
@Word, 'SUGAR')=1))
BEGIN
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'S'
SET @CurrentPosition = @CurrentPosition + 1
END
ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'SH')=1)
BEGIN
--germanic
IF (dbo.fnStringAt((@CurrentPosition + 1), @Word,
'HEIM,HOEK,HOLM,HOLZ')=1)
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'S'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'X'
END
SET @CurrentPosition = @CurrentPosition + 2
END
--italian & armenian
ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'SIO,SIA')=1) OR
(dbo.fnStringAt(@CurrentPosition, @Word, 'SIAN')=1)
BEGIN
IF (dbo.fnSlavoGermanic(@Word)=0)
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'X'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'S'
END
SET @CurrentPosition = @CurrentPosition + 3
END
--german & anglicisations, e.g. 'smith' match 'schmidt', 'snider' match 'schneider'
--also, -sz- in slavic language altho in hungarian it is pronounced 's'
ELSE IF (((@CurrentPosition = 1)
AND (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'M,N,L,W')=1))
OR (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'Z')=1))
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'X'
IF (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'Z')=1)
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'SC')=1)
BEGIN
--Schlesinger's rule
IF (SUBSTRING(@Word,@CurrentPosition + 2,1) = 'H')
BEGIN
--dutch Origin, e.g. 'school', 'schooner'
IF (dbo.fnStringAt((@CurrentPosition + 3), @Word,
'OO,ER,EN,UY,ED,EM')=1)
BEGIN
--'schermerhorn', 'schenker'
IF (dbo.fnStringAt((@CurrentPosition + 3), @Word, 'ER,EN')=1)
BEGIN
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'SK'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'SK'
SET @MP2 = @MP2 + 'SK'
END
SET @CurrentPosition = @CurrentPosition + 3
END
ELSE
BEGIN
IF ((@CurrentPosition = 1) AND
(dbo.fnIsVowel(SUBSTRING(@Word,3,1))=0) AND (SUBSTRING(@Word,3,1) <> 'W'))
BEGIN
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'S'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'X'
END
SET @CurrentPosition = @CurrentPosition + 3
END
END
ELSE IF (dbo.fnStringAt((@CurrentPosition + 2), @Word, 'I,E,Y')=1)
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'S'
SET @CurrentPosition = @CurrentPosition + 3
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'SK'
SET @MP2 = @MP2 + 'SK'
SET @CurrentPosition = @CurrentPosition + 3
END
END
ELSE
BEGIN
--french e.g. 'resnais', 'artois'
IF ((@CurrentPosition = @WordLength) AND
(dbo.fnStringAt((@CurrentPosition - 2), @Word, 'AI,OI')=1))
BEGIN
SET @MP1 = @MP1 + ''
SET @MP2 = @MP2 + 'S'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'S'
END
IF (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'S,Z')=1)
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
END
ELSE IF @CurrentChar = 'T'
BEGIN
IF (dbo.fnStringAt(@CurrentPosition, @Word, 'TION,TIA,TCH')=1)
BEGIN
SET @MP1 = @MP1 + 'X'
SET @MP2 = @MP2 + 'X'
SET @CurrentPosition = @CurrentPosition + 3
END
ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'TH,TTH')=1)
BEGIN
--special case 'thomas', 'thames' or germanic
IF (dbo.fnStringAt((@CurrentPosition + 2), @Word, 'OM,AM')=1)
OR (dbo.fnStringAt(1, @Word, 'VAN ,VON ,SCH')=1)
BEGIN
SET @MP1 = @MP1 + 'T'
SET @MP2 = @MP2 + 'T'
END
ELSE
BEGIN
SET @MP1 = @MP1 + '0'
SET @MP2 = @MP2 + 'T'
END
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
IF (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'T,D')=1)
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
SET @MP1 = @MP1 + 'T'
SET @MP2 = @MP2 + 'T'
END
END
ELSE IF @CurrentChar = 'V'
BEGIN
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'V')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
SET @MP1 = @MP1 + 'F'
SET @MP2 = @MP2 + 'F'
END
ELSE IF @CurrentChar = 'W'
BEGIN
--can also be in middle of Word
IF (dbo.fnStringAt(@CurrentPosition, @Word, 'WR')=1)
BEGIN
SET @MP1 = @MP1 + 'R'
SET @MP2 = @MP2 + 'R'
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE IF ((@CurrentPosition = 1)
AND ((dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition + 1,1))=1)
OR (dbo.fnStringAt(@CurrentPosition, @Word, 'WH')=1)))
BEGIN
--Wasserman should match Vasserman
IF (dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition + 1,1))=1)
BEGIN
SET @MP1 = @MP1 + 'A'
SET @MP2 = @MP2 + 'F'
END
ELSE
BEGIN
--need Uomo to match Womo
SET @MP1 = @MP1 + 'A'
SET @MP2 = @MP2 + 'A'
END
SET @CurrentPosition = @CurrentPosition + 1
END
--Arnow should match Arnoff
ELSE IF (((@CurrentPosition = @WordLength) AND
(dbo.fnIsVowel(SUBSTRING(@Word,@CurrentPosition - 1,1))=1))
OR (dbo.fnStringAt((@CurrentPosition - 1), @Word,
'EWSKI,EWSKY,OWSKI,OWSKY')=1)
OR (dbo.fnStringAt(1, @Word, 'SCH')=1))
BEGIN
SET @MP1 = @MP1 + ''
SET @MP2 = @MP2 + 'F'
SET @CurrentPosition = @CurrentPosition + 1
END
--polish e.g. 'filipowicz'
ELSE IF (dbo.fnStringAt(@CurrentPosition, @Word, 'WICZ,WITZ')=1)
BEGIN
SET @MP1 = @MP1 + 'TS'
SET @MP2 = @MP2 + 'FX'
SET @CurrentPosition = @CurrentPosition + 4
END
-- skip it
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
ELSE IF @CurrentChar = 'X'
BEGIN
--french e.g. breaux
IF (NOT((@CurrentPosition = @WordLength)
AND ((dbo.fnStringAt((@CurrentPosition - 3), @Word, 'IAU,EAU')=1)
OR (dbo.fnStringAt((@CurrentPosition - 2), @Word,
'AU,OU')=1))) )
BEGIN
SET @MP1 = @MP1 + 'KS'
SET @MP2 = @MP2 + 'KS'
END
IF (dbo.fnStringAt((@CurrentPosition + 1), @Word, 'C,X')=1)
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
ELSE IF @CurrentChar = 'Z'
BEGIN
--chinese pinyin e.g. 'zhao'
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'H')
BEGIN
SET @MP1 = @MP1 + 'J'
SET @MP2 = @MP2 + 'J'
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
IF ((dbo.fnStringAt((@CurrentPosition + 1), @Word, 'ZO,ZI,ZA')=1)
OR ((dbo.fnSlavoGermanic(@Word)=1) AND ((@CurrentPosition >
1) AND SUBSTRING(@Word,@CurrentPosition - 1,1) <> 'T')))
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'TS'
END
ELSE
BEGIN
SET @MP1 = @MP1 + 'S'
SET @MP2 = @MP2 + 'S'
END
IF (SUBSTRING(@Word,@CurrentPosition + 1,1) = 'Z')
BEGIN
SET @CurrentPosition = @CurrentPosition + 2
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
END
ELSE
BEGIN
SET @CurrentPosition = @CurrentPosition + 1
END
END
--only give back 4 char metaphone
IF (LEN(@MP1) > 4)
BEGIN
SET @MP1 = LEFT(@MP1, 4)
END
IF (LEN(@MP2) > 4)
BEGIN
SET @MP2 = LEFT(@MP2, 4)
END
IF @MP2 = @MP1
BEGIN
SET @MP2 = ''
END
INSERT @DMP(Metaphone1,Metaphone2) VALUES( @MP1, @MP2 )
RETURN
END
GO;
------------------------------------------------------------------------
IF OBJECT_ID('fnDoubleMetaphoneScalar') IS NOT NULL BEGIN DROP FUNCTION
fnDoubleMetaphoneScalar END
GO;
CREATE FUNCTION fnDoubleMetaphoneScalar( @MetaphoneType int, @Word varchar(50) )
RETURNS char(4)
AS
BEGIN
RETURN (SELECT CASE @MetaphoneType WHEN 1 THEN Metaphone1
WHEN 2 THEN Metaphone2 END FROM fnDoubleMetaphoneTable( @Word ))
END
こうやって
create table person(
personid int identity(1,1) primary key,
firstname varchar(20),
lastname varchar(20),
addressindex int,
sound varchar(10)
)
後でトリガーを作成します
create trigger trigoninsert for dbo.person
on insert
as
declare @personid int;
select @personid=personid from inserted;
update person
set sound=soundex(firstname) where personid=@personid;
今私ができることは、次のような手順を作成できることです
create procedure getfuzzi(@personid int)
as
declare @sound varchar(10);
set @sound=(select sound from person where personid=@personid;
select personid,firstname,lastname,addressindex from person
where sound=@sound
これにより、特定の人物に対して提供された名前とほぼ一致するすべての名前が返されます。
SQL ServerのSOUNDEXおよび関連するDIFFERENCE関数を使用して、同様の名前を見つけることができます。 MSDNのリファレンスは here です。