Question

Here is my simple Inner Join:

SELECT paintings.*, locations.*
 FROM paintings
 INNER JOIN locations
 ON locations.work_type = 'paintings' AND locations.work_id = 'paintings.id'     
 WHERE locations.location LIKE '%19th%' 

It returns zero results. I expect it to find every painting row that has a match in locations table, based on having a common work_type and id. I know there are matches because

SELECT * FROM locations WHERE location LIKE '%19th%' AND work_type = 'paintings'

I get 1000+ results.

What am I doing wrong?

Thanks…

Answer 1

You need to change this part:

locations.work_id = 'paintings.id'

to this:

locations.work_id = paintings.id

Your current query requires that the locations.work_id field contain the actual literal value “paintings.id”; what you want is to require that the locations.work_id field contain the same value as the paintings.id field.