Learn more about mysql CONCAT () Functions

Mysql CONCAT) function is used to connect multiple strings into one string. It is one of the most important mysql functions. The following describes mysql CONCAT in detail for your reference.

Mysql CONCAT (str1, str2 ,...)
Returns the string generated by the connection parameter. If any parameter is NULL, the return value is NULL. There may be one or more parameters. 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, for example: select concat (CAST (int_col as char ), char_col)

Mysql> select concat ('My, s', 'ql ');

-> 'Mysql'

Mysql> select concat ('My, NULL, 'ql ');

-> NULL

Mysql> select concat (14.3 );

-> '14. 3 ′

Mysql CONCAT_WS (separator, str1, str2 ,...)
CONCAT_WS () represents CONCAT With Separator, which is a special form of CONCAT. The first parameter is the delimiter of other parameters. The separator is placed between the two strings to be connected. The delimiter can be a string or another parameter. If the Delimiter is NULL, the result is NULL. The function ignores the NULL value after any separator parameter.

Mysql> SELECT CONCAT_WS (',', 'First name', 'second name', 'last name ');

-> 'First name, Second name, Last name'

Mysql> SELECT CONCAT_WS (',', 'First name', NULL, 'last name ');

-> 'First name, Last name'

Mysql CONCAT_WS () does not ignore any null strings. (However, all NULL values are ignored ).

 

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