sql - Denormalize into pipe separated list

I have a tablle like this:

cust   acc
-----------
a      1
b      2
b      3
c      4
c      5
c      6

I want to denormalize above into the following form

cust    acc
---------------
a       1
b       2|3
c       4|5|6

please note that the acc column should now contain a pipe delimited list of accounts for any customer. Also the possible number of accounts for a customer can be variable.

how to do this using SQL ?

Answer

try this:

SELECT cust, acc = 
    STUFF((SELECT '| ' +CAST( acc as varchar(20))
           FROM  b 

           WHERE b.cust = a.cust 
          FOR XML PATH('')), 1, 2, '')
FROM  a
GROUP BY cust








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