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 exists sql w3schools 相關參考資料
ASP Exists Method - W3Schools
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EXISTS. The EXISTS command tests for the existence of any record in a subquery, and returns true if the subquery returns one or more records. https://www.w3schools.com SQL EXISTS Operator - W3Schools
The EXISTS operator is used to test for the existence of any record in a subquery. The EXISTS operator returns true if the subquery returns one or more records. https://www.w3schools.com SQL NOT - W3Schools
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