Question

I need to join two tables with a shared ID, but I only want to return a row if both tables contain a row. I found a solution with sub-queries, but want to avoid them (because this query is run multiple times a page load).

An example:

`Products`:
Name    PicID
------|-------
Test1 |   4
Test2 |   5


`Images`:
PicID   Picture
------|--------
   4  |  BLOB

A query would only return Test1 (with the blob) because Test2 doesn’t have a row in the picture table.

Thoughts?
Max

Answer 1

An INNER JOIN is used to guarantee that the matching values exist in both tables.

SELECT p.PicID, p.Name, i.Picture
    FROM Products p
        INNER JOIN Images i
            ON p.PicID = i.PicID