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Edit
concat_ws
description
Syntax
VARCHAR concat_ws(VARCHAR sep, VARCHAR str,...)
This function uses the first argument sep as the separator which combines the second with the rest to form a string. If the separator is NULL, the result is NULL. concat_ws function does not skip empty strings, but it will skip NULL values.
example
MySQL > select concat_ws("or", "d", "is");
+----------------------------+
| concat_ws('or', 'd', 'is') |
+----------------------------+
| starrocks |
+----------------------------+
MySQL > select concat_ws(NULL, "d", "is");
+----------------------------+
| concat_ws(NULL, 'd', 'is') |
+----------------------------+
| NULL |
+----------------------------+
MySQL > select concat_ws("or", "d", NULL,"is");
+---------------------------------+
| concat_ws("or", "d", NULL,"is") |
+---------------------------------+
| starrocks |
+---------------------------------+keyword
CONCAT_WS,CONCAT,WS