Concat function _ MySQL in MySQL

Source: Internet
Author: User
MySQL concat function This article introduces how to use the concat function in MySQL through examples, such as select concat ('11', '22', '33 ').
Concat functions in MySQL
Usage:
CONCAT (str1, str2 ,...)

Returns the string generated by the connection parameter. If any parameter is NULL, the return value is NULL.

Note:
If all parameters are non-binary strings, the result is a non-binary string.
If the independent variable contains any binary string, the result is a binary string.
A numeric parameter is converted to an equivalent binary string format. to avoid this, you can use an explicit cast type, for example:
Select concat (CAST (int_col as char), char_col)

The concat function of MySQL can connect one or more strings, such
Mysql> select concat ('10 ');
+ -------------- +
| Concat ('10') |
+ -------------- +
| 10 |
+ -------------- +
1 row in set (0.00 sec)

Mysql> select concat ('11', '22', '33 ');
+ ------------------------ +
| Concat ('11', '22', '33') |
+ ------------------------ +
| 1, 112233 |
+ ------------------------ +
1 row in set (0.00 sec)

When the concat function of MySQL connects to a string, if one of them is NULL, NULL is returned.
Mysql> select concat ('11', '22', null );
+ ------------------------ +
| Concat ('11', '22', null) |
+ ------------------------ +
| NULL |
+ ------------------------ +
1 row in set (0.00 sec)

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