JSON_ARRAYAGG

MariaDB starting with 10.5.0

JSON_ARRAYAGG was added in MariaDB 10.5.0.

Syntax

JSON_ARRAYAGG(column_or_expression) [over_clause]

Description

JSON_ARRAYAGG returns a JSON array containing an element for each value in a given set of JSON or SQL values. It acts on a column or an expression that evaluates to a single value.

Returns NULL in the case of an error, or if the result contains no rows.

Can be used as a window function (by specifying the over_clause).

Examples

CREATE TABLE t1 (a INT, b INT);

INSERT INTO t1 VALUES (1, 1),(2, 1), (1, 1),(2, 1), (3, 2),(2, 2),(2, 2),(2, 2);

SELECT JSON_ARRAYAGG(a), JSON_ARRAYAGG(b) FROM t1;
+-------------------+-------------------+
| JSON_ARRAYAGG(a)  | JSON_ARRAYAGG(b)  |
+-------------------+-------------------+
| [1,2,1,2,3,2,2,2] | [1,1,1,1,2,2,2,2] |
+-------------------+-------------------+

SELECT JSON_ARRAYAGG(a), JSON_ARRAYAGG(b) FROM t1 GROUP BY b;
+------------------+------------------+
| JSON_ARRAYAGG(a) | JSON_ARRAYAGG(b) |
+------------------+------------------+
| [1,2,1,2]        | [1,1,1,1]        |
| [3,2,2,2]        | [2,2,2,2]        |
+------------------+------------------+

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