April 2008
Intermediate to advanced
566 pages
21h 55m
English
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Name
DATE_SUB()
Synopsis
DATE_SUB(date, INTERVALnumbertype)
Use this function to subtract from the results of a date or time data type column. See Table 12-1, under the description of DATE_ADD(), for a list of interval types. Here is an example of this function:
SELECT NOW( ) AS Today, DATE_SUB(NOW( ), INTERVAL 1 DAY) AS Yesterday; +---------------------+---------------------+ | Today | Yesterday | +---------------------+---------------------+ | 2007-05-14 14:26:54 | 2007-05-13 14:26:54 | +---------------------+---------------------+
Notice in this example that the time remains unchanged, but the
date was reduced by one day. If you place a negative sign in front of
the value 1, the reverse effect will occur, giving a result of May 15
in this example. Any intervals that can be used with DATE_ADD() can also be used with
DATE_SUB().
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