concatenation - Concatenate two columns based upon another column in SQL Server 2005 -

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i have database follows

a     b 1   ereee 2   ereee 2   sdfsd 3   nere 1   sdfsd

i want have data follows

a     b 1   ereee,sdfsd 2   ereee,sdfsd 3   nere

what query?

your question didn't specify kind of database. following works mysql , perhaps few others:

group_concat(expr)
function returns string result concatenated non-null values group.

https://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat

select a, group_concat(b separator ',') b  table group

update 2015-07-30 09:43 +0000

since it's been made clear sql server 2005, question might duplicate of this:

simulating group_concat mysql function in microsoft sql server 2005?


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