mysql日期相差datediff函数
#日期相差:datadiff，两个参数为时间类型
SELECT DATEDIFF('2019-2-28','2019-2-2');
SELECT DATEDIFF(MAX(hiredate),MIN(hiredate)) AS difference FROM employees;
SELECT DATEDIFF(NOW(),'2012-12-2') ;本文题目：mysql日期相差datediff函数
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