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工作学习 / 专业技术讨论 / SQL tunning,
-waiting(OK);
2007-2-5
{736}
(#3479386@0)
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用 not existsselect * from table_1 t1 where not exists (select 1 from table_2 t2 where t2.table_1_id = t1.table_1_id and t2.user_id<>'xxx')
最好在 table_2.table_1_id 上建索引
-newkid(newkid);
2007-2-5
{166}
(#3479416@0)