How to get maximum ID and store it in int in SQL server 2005

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SQL-Server-2005

OLTP named FYP Project
Data Warehouse named FYPStarSchema
Once i have load data warehouse now i want to load it again but it give an error of violation of primary key(duplication cannot be allowed)

Insert Into Product_Dimension(Product_key,Product_Name,Product_Colour,Sale_Price,Cost_Price)
SELECT P_ID, articleNO, colour, Cur_Sale_Price, CostPrice
FROM [FYP Project].dbo.Product
select max(Product_key) from Product_Dimension
int a=max(Product_key)
where Product_key>a
SELECT MAX(Product_key) AS largest FROM Product_Dimension WHERE Product_key > largest
select * from Product_Dimension

Posted 8-Dec-12 22:15pm

fahad hassan 2050

Updated 8-Dec-12 23:00pm

v2

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fahad hassan 2050 9-Dec-12 4:56am

OLTP named FYP Project
Data Warehouse named FYPStarSchema
Once i have load data warehouse now i want to load it again but it give an error of violation of primary key(duplication cannot be allowed)

Insert Into Product_Dimension(Product_key,Product_Name,Product_Colour,Sale_Price,Cost_Price)
SELECT P_ID, articleNO, colour, Cur_Sale_Price, CostPrice
FROM [FYP Project].dbo.Product
select max(Product_key) from Product_Dimension
int a=max(Product_key)
where Product_key>a
SELECT MAX(Product_key) AS largest FROM Product_Dimension WHERE Product_key > largest
select * from Product_Dimension

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OriginalGriff · Answer 1 · 2012-12-08T22:20:00

Your query makes no sense at all - even ignoring the sytax errors. What it effectivly comes down to is:

SELECT MAX(column) AS largest FROM table WHERE column > largest

Which is clearly silly - it can't return any records that are larger than the largest value, because if a record was larger than the largest, it would be the largest! Paradox, I'm afraid.

If you want to return the largest value in a column then just do that:

SELECT MAX(Product_Key) FROM Product_Dimension

That will return a single value, the largest in the table.