presto sql date_diff
时间: 2023-07-06 18:10:53 浏览: 76
在 Presto SQL 中,可以使用`date_diff`函数来计算两个日期之间的差值,例如:
```
SELECT date_diff('day', DATE '2022-01-01', DATE '2022-01-10');
```
这将返回两个日期之间相差的天数,即 9。`date_diff`函数的第一个参数指定要计算的时间单位,可以是`year`、`quarter`、`month`、`week`、`day`、`hour`、`minute`或`second`。第二个和第三个参数分别是要计算差值的两个日期。
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 date_sub
`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.