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Syntax:
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.
URL: https://dev.mysql.com/doc/refman/8.0/en/string-functions.html
Example
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'
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