1.计算日期的加减

SELECT  t2.create_time,  t2.create_time + INTERVAL 5 DAYFROM  table t2LIMIT 100

输出结果：

mysql日期加法函数 mysql日期加减_mysql 两个日期加减

2.求两个日期(指存储在不同行之间的天数)之间相差的天数，如在招聘表中确定招聘某个员工的日期与招聘下个员工的日期

SELECT  t.id,  t.create_time,  (    SELECT      min(t2.create_time)    FROM      table t2    WHERE      t2.create_time > t.create_time  )FROM  table tWHERE  t.id = 3

3.从表中随机返回n条记录

SELECT  introFROM  table  order by  rand()   limit 5

4.将空值转换为实际值

SELECT  coalesce(intro,0)FROM  table

5.计算累加

SELECT t2.id,t2.duration,(SELECT  sum(t.duration)FROM  table tWHERE  t.id <= t2.id) from table t2

6.计算累乘

SELECT  t2.id,  t2.duration,  (    SELECT      exp(sum(LN(t.duration)))    FROM      table t    WHERE      t.id <= t2.id  )FROM  table t2where t2.id <100