Syntax

PERIOD_DIFF(P1,P2)

Description

Returns the number of months between periods P1 and P2. P1 and P2 can be in the format YYMM or YYYYMM, and are not date values.

If P1 or P2 contains a two-digit year, values from 00 to 69 are converted to from 2000 to 2069, while values from 70 are converted to 1970 upwards.

Examples

SELECT PERIOD_DIFF(200802,200703);
+----------------------------+
| PERIOD_DIFF(200802,200703) |
+----------------------------+
|                         11 |
+----------------------------+

SELECT PERIOD_DIFF(6902,6803);
+------------------------+
| PERIOD_DIFF(6902,6803) |
+------------------------+
|                     11 |
+------------------------+

SELECT PERIOD_DIFF(7002,6803);
+------------------------+
| PERIOD_DIFF(7002,6803) |
+------------------------+
|                  -1177 |
+------------------------+