mysql case when使用

## mysql case when使用
SELECT order_no,
case is_test 
when 0 then '否'
when 1 then '是'
end as '是否测试' from `tbl_order` WHERE `order_no` in (
'afsd122112121'
);SELECT order_no,
case is_test 
when 0 then '否'
else '是'
end as '是否测试' from `tbl_order` WHERE `order_no` in (
'afsd122112121'
);SELECT order_no,
case WHEN  is_test  = 0 then '否'
else '是'
end as '是否测试' from `tbl_order` WHERE `order_no` in (
'afsd122112121'
);