SQL query: Number of comments posted in last 24 hours by people a user is following

Posted by bflora on Stack Overflow See other posts from Stack Overflow or by bflora
Published on 2011-01-04T00:50:24Z Indexed on 2011/01/04 0:53 UTC
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I've got a site where users follow users they like and can read their latest updates.

I'd like to show my users a simple count of how many comments the people they follow have posted in the last 24 hours. I'm having trouble figuring out the query.

I have two tables.

comment -cid (comment id) -timestamp -uid (id of person who posted the comment) -comment (content of the comment)

user_relationships -requester_id (id of the user who followed the person) -requestee_id (id of the person who was followed)

In plain english, I think the query is something like this:

COUNT the cid.comment from the comments table where uid.comment is equal to requestee_id.user_relationships associated with requester_id.user_relationships value of X.

I need to get all the UIDs of people being followed by a given UID from the user_relationship table. Then count up how many comments those people have posted in the last 24 hours and spit that number out.

What would this query look like?

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