SELECt DISTINCT idFROM tableWHERe id NOT IN (SELECt id FROM table WHERe val = 'current')
或者：
SELECt a.idFROM table aLEFT JOIN table b ON a.id = b.id AND b.val = 'current'WHERe b.id IS NULL
SELECt DISTINCT idFROM tableWHERe id NOT IN (SELECt id FROM table WHERe val = 'current')
或者：
SELECt a.idFROM table aLEFT JOIN table b ON a.id = b.id AND b.val = 'current'WHERe b.id IS NULL
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