日常有時(shí)候?qū)С鰯?shù)據(jù)需求時(shí)，數(shù)據(jù)列會(huì)遇到帶有分隔符的ID，但又需要匹配維表（如下圖所示）將ID變成名稱。

這種情況可以采用“分隔-匹配-合并”的方法

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具體代碼為：?

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-- 準(zhǔn)備工作1：創(chuàng)建事實(shí)表數(shù)據(jù) CREATE TABLE #StudentSubject ( StuID INT IDENTITY(1,1) NOT NULL, StuSubject VARCHAR(500) NOT NULL ) INSERT INTO #StudentSubject(StuSubject) VALUES ('1') INSERT INTO #StudentSubject(StuSubject) VALUES ('2') INSERT INTO #StudentSubject(StuSubject) VALUES ('2,3') INSERT INTO #StudentSubject(StuSubject) VALUES ('2,3,4') INSERT INTO #StudentSubject(StuSubject) VALUES ('1,2,3,4') INSERT INTO #StudentSubject(StuSubject) VALUES ('4')-- 準(zhǔn)備工作2：創(chuàng)建維表數(shù)據(jù) CREATE TABLE #D_Subject ( SubjectID INT IDENTITY(1,1) NOT NULL, SubjectName VARCHAR(500) NOT NULL )INSERT INTO #D_Subject(SubjectName) VALUES ('語文') INSERT INTO #D_Subject(SubjectName) VALUES ('數(shù)學(xué)') INSERT INTO #D_Subject(SubjectName) VALUES ('英語') INSERT INTO #D_Subject(SubjectName) VALUES ('體育')SELECT * FROM #StudentSubject SELECT * FROM #D_Subject ;-- 1分離：將逗號(hào)分隔的StuSubject分離匹配StudentSubject獲取標(biāo)簽 WITH CetSubject AS ( SELECT StuID,CAST(LEFT(StuSubject, CHARINDEX(',', StuSubject + ',') - 1) AS NVARCHAR(100)) SubjectID,CAST(STUFF(StuSubject + ',', 1, CHARINDEX(',', StuSubject + ','), '') AS NVARCHAR(100)) SplitFROM #StudentSubjectUNION ALL SELECT StuID,CAST(LEFT(Split, CHARINDEX(',', Split) - 1) AS NVARCHAR(100)) SIds,CAST(STUFF(Split, 1, CHARINDEX(',', Split), '') AS NVARCHAR(100)) SplitFROM CetSubjectWHERE split > '' ) -- 2匹配 將分離后的數(shù)據(jù)逐行與維表匹配 SELECT CS.StuID,DS.SubjectNameINTO #CetSubjectNameFROM CetSubject CSLEFT JOIN #D_Subject DS ON DS.SubjectID = CS.SubjectID WHERE CS.SubjectID <> '' OPTION (MAXRECURSION 0);-- 3合并 將與維表匹配的結(jié)果用逗號(hào)分隔合并還原 SELECT StuID,STUFF((SELECT ',' + T.SubjectName FROM #CetSubjectName T WHERE T.StuID = T2.StuID FOR XML PATH('')),1,1,'') SubjectNameFROM #CetSubjectName t2GROUP BY StuIDDROP TABLE #D_Subject DROP TABLE #StudentSubject DROP TABLE #CetSubjectName

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轉(zhuǎn)載于:https://www.cnblogs.com/kylan/p/10541653.html

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