Simple Decode Query

Question

Decode Query
Simplified version of query below.
SELECT
d.REG,
d.DP,
c.CHANNEL
FROM
CUSTOMER c ,
ACCOUNT d
WHERE c.ID = d.ID
GROUP BY d.REG, d.DP, c.CHANNEL
Channel Field in Customer Table contains Multiple Store ID’s (Store 1,Store 2, Store 3,Store 4 etc) – basically I want to use decode on the channel field so that instead of all Store ID’s being outputted what is outputted from Channel is
Store 1 = ‘Large’
Store 2 = ‘Medium’
Store 3 = ‘Small’
Every other store =’Other’
Where should the decode statement be inserted and what should the format be – attempt below
DECODE (c.CHANNEL, ‘Store 1,’Large’, ‘Store 2’,’Medium’, ‘Store 3’,’Small’, ‘Other’)from

Answer 1

And, just because no one else has pointed it out - using CASE instead would be neater and more lovelisome (in my opinion)...
SELECT   d.REG,
         d.DP,
         CASE c.CHANNEL
             WHEN 'Store 1'
             THEN 'Large'
             WHEN 'Store 2'
             THEN 'Medium'
             WHEN 'Store 3'
             THEN 'Small'
             ELSE 'Other'
         END Channel
FROM     CUSTOMER c,
         ACCOUNT d
WHERE    c.ID = d.ID
GROUP BY d.REG,
         d.DP,
         c.CHANNELCheers
Ben