使用嵌套查询替代相关子查询。
示例代码:
原始查询:
SELECT * FROM table1 WHERE column1 IN (SELECT column2 FROM table2 WHERE column3 = 'value');
替代查询:
SELECT * FROM table1 WHERE EXISTS (SELECT 1 FROM table2 WHERE table1.column1 = table2.column2 AND column3 = 'value');
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