CODEWITHSUNDEEP
mysqlleft-join
Nick
Nick

Reputation: 23

MySQL LEFT JOIN Problem - Missing LEFT column

I'm having problems with an SQL query used to display custom profile fields and any (optional) corresponding values.

Here is the SQL query I'm using:

SELECT pf.`id`, pf.`name`, pv.`value` FROM `profile_fields` AS pf
LEFT JOIN `profile_values` AS pv ON (pf.`id` = pv.`field_id`)
WHERE (pf.`site_id` = '0' OR pf.`site_id` = '%d') AND (pv.`user_id` = '%d' OR pv.`user_id` IS NULL)
ORDER BY pf.`order` ASC

The problem I'm having is that any columns with no corresponding profile_values records are not shown at all, when they should show, but just with an empty value.

Many thanks!

Upvotes: 2

Views: 2169

Answers (1)

Eran Galperin
Eran Galperin

Reputation: 86805

Try moving the profile values conditions to the JOIN statement:

 SELECT pf.`id`, pf.`name`, pv.`value` FROM `profile_fields` AS pf
 LEFT JOIN `profile_values` AS pv ON (
         pf.`id` = pv.`field_id`  AND 
         (pv.`user_id` = '%d' OR pv.`user_id` IS NULL)
  )
 WHERE (pf.`site_id` = '0' OR pf.`site_id` = '%d')
 ORDER BY pf.`order` ASC

Upvotes: 7

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