Question

I have following query:

SELECT * FROM 
   (
       SELECT 
       catalog.*,
       images.image 
       FROM `catalog` as catalog 
       INNER JOIN `type5` as images ON catalog.id = images.id 
       WHERE catalog.left_key > (SELECT `left_key` FROM `catalog` WHERE `id`=235) AND catalog.right_key < (SELECT `right_key` FROM `catalog` WHERE `id`=235)
       ORDER BY catalog.left_key ASC
   ) ilv

This query works well, but it SELECTS only items FROM catalog only if in table type5 is same item id.

For example in in catalog I have:

id name
 5 Hello
 7 World
 8 Foo
 9 Bar

And in type 5 I have:
id image

 5 hello.png
 8 foo.png
 9 bar.png

It will selects only

 5 Hello
 8 Foo
 9 Bar

How to edit my query to select items from catalog even if there is no same id in type5?

Answer 1

You’re using an inner join, which means it will only get the items which are in both tables.

You’re probably looking for a left outer join.

If you don’t really get how joins work, here is a good visual representation which explains it.