sql 递归查询所有的下级
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sql 递归查询所有的下级
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--> 生成測試數(shù)據(jù)表: [tb]
IF OBJECT_ID('[Users]')?IS?NOT?NULL ????DROP?TABLE?[Users] GO CREATE?TABLE?[Users] ([userid] [int],[username] [nvarchar](10),[parentUserId] [int],[parentUserName] [nvarchar](10)) INSERT?INTO?[Users] SELECT?'1','admin','0',NULL?UNION?ALL SELECT?'2','aaaaa','1','admin'?UNION?ALL SELECT?'3','bbbbb','2','aaaaa'?UNION?ALL SELECT?'4','ddddd','3','bbbbb' -->SQL查詢?nèi)缦? ;with?t?as ( ??select?*,level=1?from?Users?where?[parentUserId]=0 ??union?all ??select?a.*,level+1?from?Users a?join?t b?on?a.parentUserId=b.userid ) select?*?from?t?where?[parentUserId]<>0 /* userid????? username?? parentUserId parentUserName level ----------- ---------- ------------ -------------- ----------- 2?????????? aaaaa????? 1??????????? admin????????? 2 3?????????? bbbbb????? 2??????????? aaaaa????????? 3 4?????????? ddddd????? 3??????????? bbbbb????????? 4 (3 行受影響) */總結(jié)
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