MYSQL INNER JOIN with possible empty fields

Question

Ok, I have a problem with joining 2 tables (with INNER JOIN). First table containts categories list (ecc. for photo albums, or blog posts) while the second table contains \"the

Answer 1

To retain the rows from galeries with no matching ID in photos, you will need to join photos on galeries with LEFT JOIN instead of INNER JOIN:

SELECT galeries_id, galeries_title, 
       photos.photos_id, photos.photos_gal_id, photos.photos_link 
FROM galeries 
LEFT JOIN photos 
ON galeries.galeries_id=photos.photos_gal_id 
GROUP BY photos_gal_id

 

This will give you:

galeries_id      galeries_title       photos_id       photos_link
     1               blabla              3            test.jpg
     2               bla bla2            NULL         NULL                
     3               etata               5            test.jpg

 

And if you wish to replace NULL with an empty string, you can use:

SELECT
  IFNULL(photos.photos_id, ''),
  IFNULL(photos.photos_link, '')