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SELECT * FROM
(select customer_id,cash,type,dt from table1
union all
select customer_id,cash,type,dt from table2)AS T
union all
select customer_id,cash,type,dt from table3
order by dt
????select customer_id,cash,type,dt from table1
union all
select customer_id,cash,type,dt from table2
union all
select customer_id,cash,type,dt from table3
order by dt