Using conditions with SELECT

Question

I am trying to gather conditional data from a table based on data from another as shown below :
SELECT NEW_ITEM.CD, CLIENT_DISCOUNT.SHOPPER_ID,
If CLIENT_DISCOUNT.DISCOUNT<=NEW_ITEM.MAX_DISC then NEW_ITEM.BASE_PRICE*((100-CLIENT_DISCOUNT.DISCOUNT])/100)Else NEW_ITEM.BASE_PRICE*((100-NEW_ITEM.MAX_DISC)/100) AS CAT_PRICE
End If
FROM NEW_ITEM, CLIENT_DISCOUNT
WHERE CLIENT_DISCOUNT.SHOPPER_ID='Ted';
but i am getting the error "FROM is not where expected".
So my questions are :
1. If it is possible to put If ... Then ... Else inside a Select query and
2. If yes, what is the correct syntax.
Thank you in advance.

Answer 1

You can use a CASE... END statement in SQL to achieve the desired result.
Your query would look something like this :
select n.cd, c.shopper_id, CASE WHEN c.discount <= n.max_disc THEN n.base_price*((100 - c.discount)/100)
ELSE n.base_price*((100 - n.max_disc)/100)
END as ItemPrice
from new_item n , client_discount c where c.shopper_id='Ted'
Ideally your query should have one more condition like n.itemId = c.itemId in the where clause to limit the
query results otherwise it will result in a cartesain product.
Chandar