php，$sql = "SELECT * FROM table_name WHERE id IN (SELECT parent_id FROM another_table WHERE condition)";，``，，这段代码通过子查询先获取满足条件的parent_id，然后在主查询中使用这些id来获取相应的记录。php，$sql = "SELECT * FROM table_name WHERE id IN (SELECT parent_id FROM another_table WHERE condition)";，``，，这段代码通过子查询先获取满足条件的parent_id，然后在主查询中使用这些id来获取相应的记录。Powered By Z-BlogPHP 1.7.3
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