T SQL Conditional String Concatenation

Question

Have a 5 columns of address data. I need to concatenate these fields into a single address with spaces in between the values if they exist. If the column has a null value

Answer 1

I have assumed your data types are all varchar or similar for simplicity. If you are OK with removing any double spaces, how about:

rtrim(ltrim(replace(isnull(street_number) + ' ' 
    + isnull(street_ext) + ' ' 
    + isnull(street_direct) + ' ' 
    + isnull(site_street) + ' ' 
    + isnull(site_address), '  ', ' ')))