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trying to understand INTERVAL

Thread began 2/20/2015 4:29 am by Jamie | Last modified 2/20/2015 2:11 pm by Jamie | 387 views | 3 replies

Jason ByrnesWebAssist

honestly the expression does not make any sense as it is used in this query.

CURDATE() returns the date in yyyy-mm-dd format:
2015-02-20

(CURDATE() + INTERVAL 0 HOUR) returs the current date, but adds the time as well in the format yyyy-mm-dd hh:ii:ss
2015-02-20 00:00:00

setting the interval to 1 hour adds an hour to the time:
2015-02-20 01:00:00

So, why do i say it doesn't make any sense to add the interval you ask. . .

well because the value you are comparing to does not contain the time any way:

DATE_FORMAT(PresentationDate, '%Y-%m-%d')

this value is formatted as yyyy-dd-mm already

so, if that value returns todays date the where clause:
DATE_FORMAT(PresentationDate, '%Y-%m-%d') >= (CURDATE() + INTERVAL 0 HOUR)

would mean:
2015-02-20 >= 2015-02-20 00:00:00

which evaluates to true, but really the time portion is not needed. you could just as easily do:
DATE_FORMAT(PresentationDate, '%Y-%m-%d') >= CURDATE()

which would mean:
2015-02-20 >= 2015-02-20


Now if you add 1 hour:
DATE_FORMAT(PresentationDate, '%Y-%m-%d') >= (CURDATE() + INTERVAL 1 HOUR)

now the comparison becomes:
2015-02-20 >= 2015-02-20 01:00:00

which is false

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