Hi I'm trying to select users with a particular role only, using the following sql statement...
SELECT DISTINCT ID, u.user_login, u.user_nicename, u.user_email
FROM wp_users u, wp_usermeta m
WHERE m.meta_key = 'wp_capabilities'
AND m.meta_value LIKE '%supplier%'
ORDER BY u.user_registered
However, it reurns the whole table. What am I doing wrong?
PS this needs to be a SQL select as I'm doing this in myphpadmin to export the data to csv.
Thanks in advance!
Hi I'm trying to select users with a particular role only, using the following sql statement...
SELECT DISTINCT ID, u.user_login, u.user_nicename, u.user_email
FROM wp_users u, wp_usermeta m
WHERE m.meta_key = 'wp_capabilities'
AND m.meta_value LIKE '%supplier%'
ORDER BY u.user_registered
However, it reurns the whole table. What am I doing wrong?
PS this needs to be a SQL select as I'm doing this in myphpadmin to export the data to csv.
Thanks in advance!
Share Improve this question asked Oct 11, 2011 at 14:02 GyroGyro 651 gold badge1 silver badge6 bronze badges 2- You might have more luck over at the Stack Exchange Database Administrators site. – Chris_O Commented Oct 11, 2011 at 15:41
- 1 @Chris_O I disagree. While this is pertinent to generic DB operations, it also does cover bits of the WordPress API as shown by kaiser's answer below. I think it should stay. – EAMann Commented Oct 11, 2011 at 22:05
2 Answers
Reset to default 6Double-check your SQL syntax. It sounds like you want to do a JOIN ... But you're not building the query correctly.
It should be something more like:
SELECT u.ID, u.user_login, u.user_nicename, u.user_email
FROM $wpdb->users u
INNER JOIN $wpdb->usermeta m ON m.user_id = u.ID
WHERE m.meta_key = 'wp_capabilities'
AND m.meta_value LIKE '%supplier%'
ORDER BY u.user_registered
You have to tell the query how you're relating the user meta to the user.
Also note that I'm using $wpdb-> rather than wp_. This is important if you ever expect to use this query in a plugin on a site with a database prefix other than "wp." If you're running things directly in SQL, though, you should switch back.
There's a (query-)class built into core:
new WP_User_Query;
// Example
$all_subscribers = new WP_User_Query( array( 'role' => 'subscriber' ) );
This then allows looping through the user objects:
// Example
foreach ( $all_subscribers as $subscriber )
{
echo $subscriber->display_name;
// Check object:
var_dump( $subscriber );
}
For further examples, or querying users by other fields, please consult the codex.