Allows you to define an interval of time in terms of days, hours, minutes, and seconds (including fractional seconds). INTERVAL DAY [(day_precision)] TO SECOND [(frac_sec_prec)] day_precision:day 的位数,范围:0~9,默认
SUBDATE(date,INTERVALexprtype) SUBDATE(expr,days) 当被第二个参数的 INTERVAL型式调用时, SUBDATE()和DATE_SUB()的意义相同。对于有关INTERVAL参数的信息, 见有关 DATE_ADD()的讨论。 mysql>SELECT DATE_SUB('1998-01-02', INTERVAL 31 DAY); -> '1997-12-02' mysql>SELECT SUBDATE('1998-01-02'...
ADDDATE(date,INTERVALexprtype) ADDDATE(expr,days) 当被第二个参数的INTERVAL格式激活后, ADDDATE()就是DATE_ADD()的同义词。相关函数SUBDATE() 则是DATE_SUB()的同义词。对于INTERVAL参数上的信息 ,请参见关于DATE_ADD()的论述。 mysql>SELECT DATE_ADD('1998-01-02', INTERVAL 31 DAY); -> '1998-...
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DATE_SUB(date,INTERVAL expr type)&SUBDATE(date,INTERVAL expr type) 对日期时间进行加减法运算 (ADDDATE()和SUBDATE()是DATE_ADD()和DATE_SUB()的同义词,也可以用运算符 和-而不是函数 date是一个DATETIME或DATE值,expr对date进行加减法的一个表达式字符串type指明表达式expr应该如何被解释 ...
INTERVAL 1 WEEK AS interval_week, toIntervalWeek(1) AS interval_to_week, toIntervalMonth(1) AS interval_to_month SELECT date + interval_week, date + interval_to_week, date + interval_to_month; WITH toDateTime('2019-01-01 12:10:10') as datetime, INTERVAL 1 HOUR AS interval_hour, ...
INTERVAL 1 WEEK AS interval_week, toIntervalWeek(1) AS interval_to_week, toIntervalMonth(1) AS interval_to_month SELECT date + interval_week, date + interval_to_week, date + interval_to_month; WITH toDateTime('2019-01-01 12:10:10') as datetime, INTERVAL 1 HOUR AS interval_hour, ...
注意,从前面的例子中词INTERVAL和type关键词不是区分大小写的。 给出一个日期date,返回一个天数(从0年的天数)。 TO_DAYS(date) 1. mysql> select TO_DAYS(950501); -> 728779 mysql> select TO_DAYS('1997-10-07'); -> 729669 1. 2. 3. 4. 5. 6. 7. TO_DAYS()不打算用于使用格列高里历(...