to sort
For example: when using the ascending order of creation time, and want to put the empty field value at the end, you can write like this
select * from test t order by t.overtime_at is null, t.overtime_at
For example: when using the ascending order of creation time, and want to put the empty field value at the end, you can write like this
select * from test t order by t.overtime_at is null, t.overtime_at