Question

SQL query which select the record from three tables and there is no relation between these tables. Actually I want to make it a VIEW.

suppose there are three tales Table1, Table2, Table3

I want to show records of Table1 first with some filter criteria
and then the records from Table2
and in last from Table3 as when we execute the view it show like the records like a Table.

There can be any number of rows but the records must be in this sequence.

Answer 1

I would suggest using UNION ALL instead of union if you want all the records from each of the tables. UNION will use a distinct to filter out duplicates. If you don’t need tht it is just slowing down the query.

A further explanation here:
http://wiki.lessthandot.com/index.php/Union_All

To show you how to handle when you don’t have all the columns in each table:

select 
   1 as seq,col1, col2, col3, cast(null as varchar (40)) as col4 
   FROM Table1 
   where ... 
UNION ALL 
select 
   2 as seq,'Unknown', col2, null, col4 
   FROM Table2 
   where ... 
UNION ALL 
select 
   3 as seq ,col1, col2, col3, cast(null as varchar (40)) as col4  
   FROM Table3 
   where ... 
ORDER BY seq