MySQL两表联查，三表联查

两表联查ui SELECT A. * , B. *  FROM memberdata A LEFT JOIN members B ON A.uid = B.uid WHERE 1  LIMIT 0 , 30spa 三表ci SELECT * FROM tx1 left join (tx2, tx3) ON (tx1.id=tx2.tid ANDtx2.tid=tx3.tid) where tx1.

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