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我怎样才能使这项工作?

$current_id=5;
SELECT Id FROM table1 WHERE Output='yes' and Time>(SELECT Time FROM table2 WHERE Id="'.$current_id.'") ORDER BY Time

谢谢!

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1 回答 1

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验证 $current_id 确实有一个值。然后检查子查询是否返回值。

查询本身看起来很合适

于 2012-03-17T11:36:11.920 回答