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
XXXX	012345-ABC	XXXXXXXXXX
delete from masking;
insert into masking values ("blahblah", "221073-01AB", "012345-ABC");
select * from masking;
a	b	c
XXXXXXXX	012345-ABCD	XXXXXXXXXX
delete from masking;
insert into masking values ("221073-01AB", "221073-01AB", "221073-01AB");
select * from masking;
a	b	c
XXXXXXXXXXX	012345-ABCD	012345-ABCD
delete from masking;