select * from devices where devgroup='0';
select * from devices where devgroup='10';
select * from devices where devgroup='20';
select * from devices where devgroup='30';
select * from devices where devgroup='40';
select * from devices where devgroup='50';
select * from devices where devgroup='60';
select * from devices where devgroup='70';
select * from devices where devgroup='80';
select * from devices where devgroup='90';