Question : aggregate function for varchar field

Is the a function or a way to create a function that will combine varchar results from a querey into an aggregate result?  For example, if my result returns 4 rows of 1 field:

SELECT colors FROM myColors
----------------------
red
blue
green
black


I want one row with one field returned:

SELECT CharSum(colors) FROM myColors
----------------------
red blue green black



Is there a function that can do this or a way to create a user defined "CharSum" function?

-Steve

Answer : aggregate function for varchar field

CREATE Function CharSum ()

Returns varchar(1000)

As
Begin
   Declare @Colors varchar(1000)
   Set @Colors = ''
   Select @Colors = @Colors + Colors + ' '
   From   myColors

Return @Colors
End