valuser on "Multisite phpmyadmin-delete multiple tables with prefix wp_xx_"

Trying to delete multiple wp multisite tables in phpmyadmin

Example Task

delete all tables belonging to site id 73 (currently there are 9 tables)

i can identify the tables as wp_73_commentmeta, wp_73_comments, etc etc

Entered the code below in the SQL tab of phpmyadmin

SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' )
    AS statement FROM information_schema.tables
    WHERE table_schema = 'istheplaDBbb9h3' AND table_name LIKE 'wp_73_%';

and clicked Go

the code appears to be accepted and while the tables appear to be identified nothing happens as no rows (0-0) are deleted

see template image of result at http://i.imgur.com/sjoVP0J.png

Obviously I am omitting something or am in the wrong tab!

Any help at all much appreciated