CONCAT_WS magic concat in mysql

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If you want to skip NULL values (but not empty strings), you can use CONCAT_WS() function:

CONCAT_WS( ', ',            -- Separator
           CONCAT_WS(' ', tadd.street_number, tadd.street_name),
           tadd.apt_number,  tadd.city, 
           tadd.postal_code, tadd.country
         ) AS Address