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INTERVAL « Date Time Functions « MySQL Tutorial
MySQL Tutorial
Date Time Functions
INTERVAL
14.22.INTERVAL
14.22.1.
Date arithmetic also can be performed using INTERVAL together with the + or - operator:
14.22.2.
SELECT INTERVAL 1 DAY + '1997-12-31';
14.22.3.
SELECT '1998-01-01' - INTERVAL 1 SECOND;