[英]SQL Select omitting results from a sub-query
我有以下代碼,當單獨運行時,它們會產生預期的結果,但是當共同運行時,則不返回任何結果:
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條記錄,子查詢返回20條記錄作為第一條查詢的子集。 我試圖返回未出現在子查詢中的165條記錄。 謝謝
您忘記輸入tbS.SurveyUID = tbS1.SurveyUID條件
嘗試這個:
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
)
您的查詢是錯誤的。 您必須編寫: ...WHERE SurveyUID NOT IN (...subquery...)
。 在查詢中,您說“如果子查詢沒有結果,請給我所有ID”,但有結果。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.