Mysql multiple table joins with derived tables -


my table details image test data

i have come below code: 

select tablename,userdets,regdate ( (select 'table1' tablename, t1.username userdets, t1.created_date regdate table1 t1 group username ) union (select 'table2' tablename, t2.username userdets, t2.created_date regdate table2 t2 group username ) union  (select 'table3' tablename, t3.username userdets, t3.created_date regdate table3 t3 group username ) ) alltablecombo  group alltablecombo.userdets

if in code use order date @ last , make subquery select group username , can obtain required output. dont want use sbuquery.
please if provide me alternative.. tried self join not success on using it....


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