Факториал в SQL

Пример для версий Microsoft SQL Server 2005

declare @max_n tinyint = 20
;with t as (
   select 1 as n, convert(bigint,1) as f
   union all
   select n+1, f*(n+1) from t
   where n < @max_n
   
)
select convert(varchar,n)+'! = '+convert(varchar(32),f)+', ' 
from t as [text] 
FOR XML PATH ('')

Факториал в SQL

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