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CONCAT_WS

CONCAT_WS(separator,str1,str2,…)

CONCAT_WS() stands for Concatenate With Separator and is a special form of CONCAT(). The first argument is the separator for the rest of the arguments. The separator is added between the strings to be concatenated. The separator can be a string, as can the rest of the arguments. If the separator is NULL, the result is NULL.

mysql> SELECT CONCAT_WS(',','First name','Second name','Last Name');
-> 'First name,Second name,Last Name'
mysql> SELECT CONCAT_WS(',','First name',NULL,'Last Name');
-> 'First name,Last Name'

CONCAT_WS() does not skip empty strings. However, it does skip any NULL values after the separator argument.

source: http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_concat-ws

Tags: concat, mysql function