How can a SQL query have two from clauses?

Question

This just looks so odd to me:

delete from GearsDev.dbo.Products 
from GearsDev.dbo.Products as C
inner join #Common as M
    on M.item = C.ItemNumber
         


        

Answer 1

From MSDN The second from allows you create a filter that corresponding rows in the first from are deleted where they match.

In this case Delete all [GearsDev].[dbo].[Products] where ItemNumber has a corresponding row in #Common with the item of the same value