Pernyataan sql SELECT saya GABUNG di tiga tabel

Jika saya mengerti pertanyaannya, yang sejujurnya tidak, apakah Anda mencari serikat pekerja?

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

edit termasuk e dan f

edit2 Anda perlu menambahkan klausa where sebelum setiap union

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