How to concatenate columns properly using T-SQL?

Question

I have a address in more than one column in a table.

SELECT FirstName, LastName, StreetAddress, City, Country, PostalCode 
FROM Client

I a

Answer 1

This is an old question and SQL 2012 added the CONCAT function that made this sort of thing a bit easier. Try this:

Select FirstName, LastName, 
    Stuff(
        Concat(
        ',' + FirstName,
        ',' + LastName,
        ',' + StreetAddress,
        ',' + City,
        ',' + Country,
        ',' + PostalCode ),
    1,1,'')
From Client

CONCAT will automatically treat NULL as empty string so you dont need to use ISNULL or COALESCE. The STUFF function is there to remove the first comma, as in the answer by Thomas