SQL select of users by metadata

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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?

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PS this needs to be a SQL select as I’m doing this in myphpadmin to export the data to csv.

Thanks in advance!

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2 comments

  1. Double-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.

  2. 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.