Join Data From 3 Tables

Question

I have 3 tables: Table1(Col1,Col2,Col3,Col4); Table2(Col1,Col2,Col3,Col4); Table3(Col1,Col2,Col3,Col4) and they all contain data. Now I want to have a Table4(Col1,Col2,Col3,Col4) and Table4 will contain all data of 3 tables: Table1, Table2, Table3.
Please help me to write a sql query to have the Table4.
Thanks,

Answer 1

You just need to create view as this
CREATE VIEW View1
AS
SELECT col1, Col2, Col3, Col4 FROM Table1
UNION ALL
SELECT col1, Col2, Col3, Col4 FROM Table2
UNION ALL
SELECT col1, Col2, Col3, Col4 FROM Table3
If you want only distinct combination use UNION
CREATE VIEW View1
AS
SELECT col1, Col2, Col3, Col4 FROM Table1
UNION
SELECT col1, Col2, Col3, Col4 FROM Table2
UNION
SELECT col1, Col2, Col3, Col4 FROM Table3
Another way is using full join syntax on dummy condition
create view view1
as
select coalesce(t1.col1,t2.col1,t3.col1) as col1,
coalesce(t1.col2,t2.col2,t3.col2) as col2,
coalesce(t1.col3,t2.col3,t3.col3) as col3,
coalesce(t1.col4,t2.col4,t3.col4) as col4
from Table1 t1
full join Table2 t2
on 1=2
full join Table3 t3
on 1=2
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