concat_ws
description
Syntax
VARCHAR concat_ws(VARCHAR sep, VARCHAR str,...)
VARCHAR concat_ws(VARCHAR sep, ARRAY array)
使用第一个参数 sep 作为连接符，将第二个参数以及后续所有参数(或ARRAY中的所有字符串)拼接成一个字符串。
如果分隔符是 NULL，返回 NULL。
concat_ws函数不会跳过空字符串，会跳过 NULL 值。
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