drop database if exists maskingdb;
create database maskingdb;
use maskingdb;
create table masking (a TEXT, b TEXT, c TEXT);
insert into masking values ("blah", "012345-ABC", "012345-ABC");
select * from masking;
a	b	c
YYYY	XXXXXXXXXX	YYYYYYYYYY
delete from masking;
insert into masking values ("blahblah", "221073-01AB", "012345-ABC");
select * from masking;
a	b	c
YYYYYYYY	012345-ABCD	YYYYYYYYYY
delete from masking;
insert into masking values ("221073-01AB", "221073-01AB", "221073-01AB");
select * from masking;
a	b	c
YYYYYYYYYYY	012345-ABCD	012345-ABCD
delete from masking;