concat_ws

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                                   |
+-----------------------------------------+