DATEDIFF函数和直接减去INTERVAL DAY有什么区别？
SELECT * FROM table WHERE DATEDIFF(CURDATE(), publish_date) <= 3
SELECT * FROM table WHERE publish_date >= CURDATE() - INTERVAL 3 DAY
结果数据是一样的，但似乎2.方法更快一点？
2.
mysql sql performance query-optimization where-clause
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