I have 3 tables they all have the same column header Name, Number I have joined them using the union command as shown below:
SELECT Name, Number
FROM table1
Union all
select name, number
from table2
UNION ALL select name, number
from table3;
Every thing is right up till here. Now I want to add a new column which should contain the information about from which table this data have been taken. I am using the alter table command but it gives error.
Kindly help me. I am working on MS access 2007.
Just add it in as a column in each subquery:
SELECT Name, Number, 'table1' as which
FROM table1
Union all
select name, number, 'table2' as which
from table2
UNION ALL
select name, number, 'table3' as which
from table3;
ALTER TABLE
only works on actual tables, not query results.
You simply need to add the information as a pseudo-column to your current query:
SELECT
Name, Number, 'Table1' as TableName
FROM
table1
Union all
select
name, number, 'Table2'
from
table2
UNION ALL
select
name, number, 'Table3'
from table3;
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