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MySQL | PERIOD_DIFF method

schedule Aug 10, 2023
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MySQL's `PERIOD_DIFF(~)` method returns the months difference between two periods.

NOTE

A period is `YYYYMM` or `YYMM` and is not the same as a date value.

Parameters

1. `P1` | `period`

Period 1 for calculation of difference `P1 - P2`

2. `P2` | `period`

Period 2 for calculation of difference `P1 - P2`.

Return value

The months difference between two periods `P1 - P2`.

Examples

To return the months difference between April 2020 and October 2008:

``` SELECT PERIOD_DIFF(202004, 200810); +----------------------------+| PERIOD_DIFF(202004,200810) |+----------------------------+| 138 |+----------------------------+ ```

To return the months difference between April 2020 and October 2028:

``` SELECT PERIOD_DIFF(202004, 202810); +----------------------------+| PERIOD_DIFF(202004,202810) |+----------------------------+| -102 |+----------------------------+ ```
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