drop user if exists 'av_realchemistry'@'192.170.1.19';
drop user if exists 'av_realchemistry'@'192.170.1.20';
drop user if exists 'av_realchemistry'@'192.170.1.21';
drop user if exists 'av_realchemistry'@'192.170.1.22';
drop user if exists 'av_realchemistry'@'localhost';
drop database if exists av_realchemistry;