How to Multiply all values within a column with SQL like SUM()

Question

Lets say I have table with 1 column like this:

Col A
1
2
3
4

If I SUM it, then I will get this:

Col A
10
         


        

Answer 1

You can do It simply by declaring an variable in following, COALESCE is used to avoid NULLS.

DECLARE @var INT

SELECT @var = Col1 * COALESCE(@var, 1) FROM Tbl

SELECT @var

SQL FIDDLE