php - WP - troubles with joining two tables -


i trying find @ internet answer, , found something, not :-)

i have 2 tables - wp_users & wp_usermeta. these 2 tables has same id (wp_users.id , wp_usermeta.user_id). want take email address wp_users , join nickname wp_usermeta.

i beginner in sql , helpful, if explain :-) thank :-)

    <?php     //i want tu print in echo user emails connected nicknames 2 separate tables - wp_users     //and wp_user_meta. trying connect these tables "id" has these 2 tables same (inner join part)     $teacher_table = "select wp_users.user_email, wp_usermeta.nickname                     wp_users,wp_usermeta                     inner join wp_usermeta on wp_users.id = wp_usermeta.user_id";     $results_table_main = $wpdb->get_results($teacher_table);      foreach ($teacher_table $value){         echo $value;     }     ?>

the previous answers , comments issue primary problem here querying column not exist, wp_usermeta.nickname

this need do:

$teacher_table = "select wp_users.user_email, wp_usermeta.meta_value  wp_users inner join wp_usermeta on wp_users.id = wp_usermeta.user_id wp_usermeta.meta_key = 'nickname'";

and measure rest of code, note returned variable object must accessed such.

 $results_table_main = $wpdb->get_results($teacher_table);  foreach ($results_table_main $value){    echo $value->user_email;    echo $value->meta_value; }

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