[英]SQL Select omitting results from a sub-query
我有以下代码,当单独运行时,它们会产生预期的结果,但是当共同运行时,则不返回任何结果:
SELECT SurveyUID FROM tbSurvey AS tbS
WHERE NOT EXISTS
(SELECT tbS.SurveyUID
FROM tbSurvey AS tbS INNER JOIN
tbSurveyElementCategory AS tbSEC ON tbS.SurveyUID = tbSEC.SurveyUID INNER JOIN
tbElementCategory AS tbEC ON tbSEC.ElementCategoryID = tbEC.ElementCategoryID
WHERE (tbEC.ElementCategoryID = 75))
第一行返回185条记录,子查询返回20条记录作为第一条查询的子集。 我试图返回未出现在子查询中的165条记录。 谢谢
您忘记输入tbS.SurveyUID = tbS1.SurveyUID条件
尝试这个:
SELECT SurveyUID
FROM tbSurvey AS tbS
WHERE NOT EXISTS (SELECT tbS1.SurveyUID
FROM tbSurvey AS tbS1
INNER JOIN tbSurveyElementCategory AS tbSEC ON tbS1.SurveyUID = tbSEC.SurveyUID
INNER JOIN tbElementCategory AS tbEC ON tbSEC.ElementCategoryID = tbEC.ElementCategoryID
WHERE (tbEC.ElementCategoryID = 75) AND tbS.SurveyUID = tbS1.SurveyUID
)
您的查询是错误的。 您必须编写: ...WHERE SurveyUID NOT IN (...subquery...)
。 在查询中,您说“如果子查询没有结果,请给我所有ID”,但有结果。
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