Update a table with join?

Question

I am trying to update table A with data from table B. I thought I can do something like this

update A 
set A.DISCOUNT = 3 
from INVOICE_ITEMS A
join ITEM_PRI         


        

Answer 1

you can use like this :

update INVOICE_ITEMS  
set DISCOUNT = 3 
from (select * from ITEM_PRICE_QUNTITY ) b
where INVOICE_ITEMS.ITEM_PRICE_NO = B.ID and 
INVOICE_ITEMS.INVOICE_ID = 33