RE: CTE

Question

Dear Readers,
I am not sure why my CTE is not working on a small table I created. Below are the DDL statements with the CTE query.
OBJECTIVE: TO practice how to eliminate duplicates:
DDL statements of the Product table:
--Create table Product
-- ProductID    int Not Null,
-- ProductName varchar(20) Not Null,
-- ProductPrice money Not null
-- Insert Product
-- Values(1, 'Box', '4.99')
-- Insert Product
-- Values(2,'Book','1.99')
-- Insert Product
-- Values(3, 'Bag','5.99')
-- Insert Product
-- Values(4, 'Water Bottle','1.99')
-- Insert Product
-- Values(2,'Book','1.99')
-- Insert Product
-- Values(5, 'Crayons','4.99')
-- Insert Product
-- Values(1, 'Box','4.99')
-- Insert Product
-- Values(2, 'Book','1.99')
-- Insert Product
-- Values(3, 'Bag','5.99')
-- Insert Product
-- Values(2, 'Book','1.99')
The CTE Query:
;With DuplicateCTE
AS
 Select
        ProductID,
        ProductName,
        ProductPrice
        Row_Number() OVER (Partition By ProductID ORDER BY ProductName) AS RowNumber
FROM
        Product
When I run the above CTE query I get the following error:
Error Message: Msg 102, Level 15, State 1, Line 185
Incorrect syntax near ')'.
Thank-you
SQL75

Answer 1

You are missing a comma after ProductPrice and you need to provide an outer query after the CTE definition.  The SELECT query below returns only the first row from each group.  If you want to delete duplicates from the table, change the outer SELECT
to "DELETE FROM DuplicateCTE WHERE RowNumber > 1".
WITH DuplicateCTE
AS
Select
ProductID,
ProductName,
ProductPrice,
Row_Number() OVER (Partition By ProductID ORDER BY ProductName) AS RowNumber
FROM
dbo.Product
SELECT
ProductID,
ProductName,
ProductPriceFROM DuplicateCTE
WHERE RowNumber = 1;
Dan Guzman, SQL Server MVP, http://www.dbdelta.com