The MySQL concat function is one of the many functions in the MySQL database. The syntax and usage of the MySQL concat function are described below for your reference and learning.
MySQL concat function 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 MySQL concat function 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') |
- +------------------------+
- | 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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