concat_ws
Description
Syntax
VARCHAR concat_ws(VARCHAR sep, VARCHAR str,...)
VARCHAR concat_ws(VARCHAR sep, ARRAY array)Using the first parameter SEP as a connector, the second parameter and all subsequent parameters(or all string in an ARRAY) are spliced into a string.
If the separator is NULL, return NULL.
The concat_ws function does not skip empty strings, it skips NULL values.
example
mysql> select concat_ws("or", "d", "is");
+----------------------------+
| concat_ws('or', 'd', 'is') |
+----------------------------+
| doris |
+----------------------------+
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") |
+---------------------------------+
| doris |
+---------------------------------+
mysql> select concat_ws("or", ["d", "is"]);
+-----------------------------------+
| concat_ws('or', ARRAY('d', 'is')) |
+-----------------------------------+
| doris |
+-----------------------------------+
mysql> select concat_ws(NULL, ["d", "is"]);
+-----------------------------------+
| concat_ws(NULL, ARRAY('d', 'is')) |
+-----------------------------------+
| NULL |
+-----------------------------------+
mysql> select concat_ws("or", ["d", NULL,"is"]);
+-----------------------------------------+
| concat_ws('or', ARRAY('d', NULL, 'is')) |
+-----------------------------------------+
| doris |
+-----------------------------------------+keywords
CONCAT_WS,CONCAT,WS,ARRAY