使用CONVERT_TZ的MySQL选择查询不起作用

Question

What's wrong here?

SELECT COUNT(*) FROM XXXXX WHERE ( XXXXX BETWEEN CONVERT_TZ('2016-04-27 00:00:00','-0:00','-8:00') AND CONVERT_TZ('2016-04-27 23:59:59','-0:00','-8:00'))

SELECT COUNT(*) FROM XXXXX WHERE ( XXXXX BETWEEN '2016-04-27 00:00:00' AND '2016-04-27 23:59:59')

Both showing equal count. What's wrong in CONVERT_TZ?

Answer 1

You have parentheses in the wrong spot. You're calling CONVERT_TZ with only one parameter, in the first case just '2016-04-27 00:00:00'.

Try:

SELECT COUNT(*) FROM `XXXXXXX` WHERE `XXXXXXXX` BETWEEN  CONVERT_TZ('2016-04-27 00:00:00','UTC','America/Los_Angeles') AND  CONVERT_TZ('2016-04-27 23:59:59','UTC','America/Los_Angeles')

Note that in order to use named time zones (like 'UTC' and 'America/Los_Angeles'), the timezone tables in the mysql system database need to be populated.