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* mysql: SELECT TIMEDIFF('2010:01:01 00:00:00', '2010:02:01 00:00:00'); /* return -744:00:00 */ | * mysql: SELECT TIMEDIFF('2010:01:01 00:00:00', '2010:02:01 00:00:00'); /* return -744:00:00 */ | ||
=== Query by month == | === Query by month === | ||
* mysql ex: find the records in January, 2014 | * mysql ex: find the records in January, 2014<ref>[http://stackoverflow.com/questions/508791/mysql-query-group-by-day-month-year sql - MySQL Query GROUP BY day / month / year - Stack Overflow]</ref> | ||
** SELECT * FROM table_name WHERE `time` >= '2014-01-01 00:00:00' AND `time` < '2014-02-01' | ** SELECT * FROM table_name WHERE `time` >= '2014-01-01 00:00:00' AND `time` < '2014-02-01' | ||
** SELECT * FROM table_name WHERE YEAR(`time`) = '2014' AND MONTH(`time`) = '1' | ** SELECT * FROM table_name WHERE YEAR(`time`) = '2014' AND MONTH(`time`) = '1' | ||