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並前往https://stackoverflow.com/questions/7805019/how-to-use-sql-select-statement-with-if-exists-sub-query

How to use SQL Select statement with IF EXISTS sub query?

Use CASE : SELECT TABEL1.Id, CASE WHEN EXISTS (SELECT Id FROM TABLE2 WHERE TABLE2.ID = TABLE1.ID) THEN 'TRUE' ELSE 'FALSE' END AS NewFiled ...

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