SQL Functions - factorial

Question

I am a beginner in SQL Functions. What is the best way to create a function for factorial in SQL Server- Say 10!

Answer 1

Try this

WITH MYCTE AS(
 SELECT VAL=1,NUM =6 
 UNION ALL
 SELECT VAL=VAL*NUM,NUM = (NUM -1)
 FROM MYCTE
 WHERE NUM > 1
)                  
SELECT VAL FROM MYCTE