constraints - MYSQL UNIQUE for date part of a date field -


i have field sync_date (type datetime) in table visit. sync_date can not repeat in same day. so, have idea have sync_date unique field. doesn't work case because don't want takes account hour part.

for example

today can have this:
sync_date = '2013-05-14 08:45:00'
today mysql shouldn't admit same '2013-05-14' anymore tomorrow can happens.


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