php / mysql - select id from one table excepting ids which are in second table
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Published on 2011-01-16T13:46:07Z
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hello.
for example i have 2 tables:
1 . users:
id Name 1 Mike 2 Adam 3 Tom 4 John 5 Andy 6 Ray
2 . visits:
userID date 1 ... 3 ... 6 ...
i want to make a page which can be visited once in 12 hours, when user visits that page his id is included in database ( visits ), how i can select all users ( from database users) excepting users who visited page in <= 12 hours ( users from database visits )?
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