DATE_SUB
Subtract the time interval or date interval from the provided date or date with time (timestamp/datetime).
Syntax
DATE_SUB(<unit>, <value>,  <date_or_time_expr>)
Arguments
| Arguments | Description | 
|---|---|
<unit> | Must be of the following values: YEAR, QUARTER, MONTH, DAY, HOUR, MINUTE and SECOND | 
<value> | This is the number of units of time that you want to add. For example, if you want to add 2 days, this will be 2. | 
<date_or_time_expr> | A value of DATE or TIMESTAMP type | 
Return Type
The function returns a value of the same type as the <date_or_time_expr> argument.
Examples
SELECT date_sub(YEAR, 1, to_date('2018-01-02'));
┌──────────────────────────────────────────┐
│ date_sub(year, 1, to_date('2018-01-02')) │
├──────────────────────────────────────────┤
│ 2017-01-02                               │
└──────────────────────────────────────────┘