Question

I find it really hard to explain what is going on, I’ll try my best.
We need to make a really simple browser with really simple Favorites + History capabilities, and to do that we need to import them both in a DataSet and use them from there.

The knowledge that I have should be enough, but I would really like to do it more efficient en cleaner. In the database I have 3 tables, one for users, one for favorites and one for history, this is linked with FK’s etc. I want a query that returns me every Fav + History url that a user has saved. This is what I have now:

SELECT u_id, u_user, h_url, f_url FROM Users, Favorites, HistoryWHERE u_id = h_id AND u_id = f_id AND u_id = 1

This isn’t the result I’m looking for, I want to fill 2 comboboxes, one with favorites and one with history that both are from the person that is logged in at that moment.

I know this should work with join but inner and outer both give to little or to many results, and left and right join don’t seem to work for me either, but I cant explain why. :p I’m semi-new to joins btw.

Answer 1

It sounds like you actually want two simple queries, one for favorites and one for history. Both queries just need to have a where clause limiting the user for whom the results are returned.

SELECT f.url
FROM Favorites f
WHERE f.userID = 1

SELECT h.url
FROM History h
WHERE h.userID = 1