concat
Description
Syntax
VARCHAR concat (VARCHAR,...)
Connect multiple strings and return NULL if any of the parameters is NULL
example
mysql> select concat("a", "b");
+------------------+
| concat('a', 'b') |
+------------------+
| ab |
+------------------+
mysql> select concat("a", "b", "c");
+-----------------------+
| concat('a', 'b', 'c') |
+-----------------------+
| abc |
+-----------------------+
mysql> select concat("a", null, "c");
+------------------------+
| concat('a', NULL, 'c') |
+------------------------+
| NULL |
+------------------------+keywords
CONCAT