SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);
问题2:如何将子查询转换为连接查询?
解答:将子查询转换为连接查询可以提高查询速度,原始查询如下:
SELECT * FROM table1 WHERE id IN (SELECT id FROM table2 WHERE name = '张三');
可以将其转换为连接查询:
SELECT * FROM table1 t1, table2 t2 WHERE t1.id = t2.id AND t2.name = '张三';
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