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select * from table1 where a1 like '%key%' and a2 like '%key%' and a2 like '%key%'
union
select * from table2 where a1 like '%key%' and a2 like '%key%' and a2 like '%key%'
union
select * from table3 where a1 like '%key%' and a2 like '%key%' and a2 like '%key%'