Pokud rozumím otázce, upřímně řečeno ne, hledáte odbor?
select a,b,c,0 as e,0 as f, test,data from table1
union
select a,b,c,e,f, test,data from table2
union
select a,b,c,0 as e,0 as f, test,data from table3
upravit včetně e a f
upravit2 Před každým sjednocením budete muset přidat klauzuli where
select a,b,c,0 as e,0 as f, test,data from table1
where test= 1 and data =1 and id =0
union
select a,b,c,e,f, test,data from table2
where test= 1 and data =1 and id =0
union
select a,b,c,0 as e,0 as f, test,data from table3
where test= 1 and data =1 and id =0