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or
DELETE s from tab1 s,tab2 t,tab1 m
WHERE s.b=m.b and  s.a=t.a and s.c=2

or
delete s from tab1 s inner join tab2 m
on s.b=m.b
inner join tab1 t on s.a=t.a
where s.c=2

delete s from tab1 s inner join (select t.a,m.b from tab1 t ,tab2 m where ...) n  on s.a=n.a and s.b=n.b
where s.c=2  ¸ã¶¨ÁË£¬Ð»Ð»WWWWAÐÖÁË¡£

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