MySQL_(Not Exists)_spring定时任务执行客户流失

表A ID NAME 1 A1 2 A2 3 A3web 表B ID AID NAME 1 1 B1 2 2 B2 3 2 B3spring SELECT ID,NAME FROM A WHERE EXISTS (SELECT * FROM B WHERE A.ID=B.AID) 执行结果为 1 A1 2 A2svg NOT EXISTS SELECT ID,NAME FROM A WHERE　N

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