Warning: mysqli_query(): (HY000/1021): Disk full (/var/mysqltmp/#sql_5cab_12.MAI); waiting for someone to free some space... (errno: 28 "No space left on device") in /home/express/public_html/classes/db/db.php on line 83

MySQL Error Occurred

Error Message:
1021: Disk full (/var/mysqltmp/#sql_5cab_12.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")

SQL:
SELECT * FROM featured_brands where home=1 order by rand() limit 12