presto date_sub
时间: 2023-09-01 08:07:24 浏览: 103
`date_sub` is a function in Presto SQL that subtracts a specified number of days from a given date. The syntax for `date_sub` is as follows:
```
date_sub(date, num_days)
```
where `date` is the initial date and `num_days` is the number of days to subtract from the date. For example, to subtract 7 days from the current date, you could use:
```
SELECT date_sub(current_date, 7);
```
This would return a date that is 7 days prior to the current date.
相关问题
presto date_add
Presto is an open-source distributed SQL query engine that supports querying data from various data sources. To add or subtract a specific number of days from a given date in Presto, you can use the `date_add` function.
The `date_add` function takes two arguments: the date or timestamp you want to modify, and the number of days you want to add or subtract. Here's an example of how to use it:
```sql
SELECT date_add(DATE '2022-01-01', 7) AS new_date;
```
This query will add 7 days to the date '2022-01-01' and return the result as '2022-01-08'. You can also subtract days by using a negative number.
Please note that the `date_add` function works with both date and timestamp data types in Presto.
presto中不支持date_sub吗
Presto是一款基于SQL的分布式查询引擎,它支持date_sub函数。date_sub函数用于计算指定日期的前一个日期或指定间隔时间之前的日期。
使用date_sub函数的语法如下:
```
date_sub(date, INTERVAL num unit)
```
其中,date参数表示要进行计算的日期,num参数表示要减去的时间数量,unit参数表示要减去的时间单位,如YEAR、MONTH、DAY等。
例如,要计算当前日期的前一天,可以使用以下语句:
```
SELECT date_sub(CURRENT_DATE, INTERVAL 1 DAY);
```
该语句将返回当前日期的前一天日期。
因此,你可以在Presto中使用date_sub函数来进行日期运算。