The Ultimate Guide to High Availability with MariaDB

GROUP_CONCAT

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Syntax

GROUP_CONCAT(expr)

Description

This function returns a string result with the concatenated non-NULL values from a group. It returns NULL if there are no non-NULL values.

The maximum returned length is determined by the group_concat_max_len server system variable, which defaults to 1024 bytes.

The full syntax is as follows:

GROUP_CONCAT([DISTINCT] expr [,expr ...]
             [ORDER BY {unsigned_integer | col_name | expr}
                 [ASC | DESC] [,col_name ...]]
             [SEPARATOR str_val])

Examples

SELECT student_name,
       GROUP_CONCAT(test_score)
       FROM student
       GROUP BY student_name;

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