starter......

SELECT TOP 10000

CustomerID = CAST(Abs(Checksum(Newid()) % 90 + 1) AS INT),

ProdID = CAST(Abs(Checksum(Newid()) % 900 + 1) AS INT)

INTO TestData

FROM sys.all_columns ac1

CROSS JOIN sys.all_columns ac2

CROSS JOIN sys.all_columns ac3

SELECT DISTINCT CustomerID

FROM TestData

SELECT DISTINCT ProdID

FROM TestData

SELECT COUNT(DISTINCT CustomerID) AS Expr1, COUNT(DISTINCT ProdID) AS Expr2

FROM TestData