date_sub全称
时间: 2023-08-20 22:06:55 浏览: 44
DATE_SUB的全称是"Date Subtract",表示日期减法函数。该函数用于从给定的日期中减去指定的时间间隔,例如减去一天、一周、一个月等。使用DATE_SUB函数可以实现日期的计算和操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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相关问题
hql date_sub
HQL (Hive Query Language) provides the `date_sub` function, which is used to subtract a specified number of days from a given date.
The syntax for the `date_sub` function in HQL is as follows:
```
date_sub(date, num_days)
```
Here, `date` is the input date from which you want to subtract days, and `num_days` is the number of days you want to subtract.
For example, to subtract 7 days from the current date, you can use the following query:
```
SELECT date_sub(current_date(), 7);
```
This will return a date that is 7 days before the current date.
Note that the `date_sub` function only works with dates and not with timestamps. If you need to subtract days from a timestamp, you can extract the date part using the `date` function and then use `date_sub`.
DATE_SUB函数
DATE_SUB函数是一个MySQL中的日期函数,用于从指定日期中减去指定的时间间隔。它的语法为:DATE_SUB(date, INTERVAL expr type),其中date是要减去的日期,expr是时间间隔的值,type是时间间隔的单位。DATE_SUB函数可以减去的时间间隔单位包括:微秒(MICROSECOND)、秒(SECOND)、分钟(MINUTE)、小时(HOUR)和天(DAY)等。
例如,如果今天是2022年1月1日,要计算1天前的日期,可以使用DATE_SUB函数,如下所示:DATE_SUB(CURRENT_DATE, INTERVAL 1 DAY)。这将返回2021年12月31日。
需要注意的是,如果日期无效或为null,DATE_SUB函数将返回null。