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VB.net SQL Create table from table with Identity column

Posted on 2014-10-22
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Last Modified: 2014-10-22
Hi

I have a number of tables in a SQL database that don't have Identity columns
I know that you can copy a table using the following statement
SELECT * INTO Table2 FROM Table1
What SQL code would I use to copy a table but add an extra identity column
at the beginning of the table?
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Question by:Murray Brown
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6 Comments
 
LVL 51

Accepted Solution

by:
Vitor Montalvão earned 500 total points
ID: 40396529
You can use ROWNUMBER to produce a new column with codes:
SELECT ROW_NUMBER() OVER(ORDER BY Table1.ColumnName) AS NewID, *
INTO Table2
FROM Table1

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Author Comment

by:Murray Brown
ID: 40396560
Hi
Thanks
I don't quite understand Table1.ColumnName
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LVL 51

Expert Comment

by:Vitor Montalvão
ID: 40396586
I don't know your table structure so you need to substitute "Table1.ColumnName" with a real column name from your table.
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Author Comment

by:Murray Brown
ID: 40396608
If my column names are Col1,Col2,Col3 all of type nvarchar(40) can I select any of these columns?
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LVL 51

Expert Comment

by:Vitor Montalvão
ID: 40396614
Using the '*' all your columns will be returned. The need for a column name it's only to order the rows so SQL Server can give them a number (an identity column for you). So you can keep the '*' and provide a column name to the ORDER BY clause (preferential a primary key column).
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Author Closing Comment

by:Murray Brown
ID: 40396620
Thanks very much Vitor. I worked it out
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