JSON_OBJECTAGG
MariaDB starting with 10.5.0
JSON_OBJECTAGG was added in MariaDB 10.5.0.
Syntax
JSON_OBJECTAGG(key, value)
Description
JSON_OBJECTAGG returns a JSON object containing key-value pairs. It takes two expressions that evaluate to a single value, or two column names, as arguments, the first used as a key, and the second as a value.
The maximum returned length in bytes is determined by the group_concat_max_len server system variable.
Returns NULL in the case of an error, or if the result contains no rows.
JSON_OBJECTAGG cannot currently be used as a window function.
Examples
select * from t1;
+------+-------+
| a | b |
+------+-------+
| 1 | Hello |
| 1 | World |
| 2 | This |
+------+-------+
SELECT JSON_OBJECTAGG(a, b) FROM t1;
+----------------------------------------+
| JSON_OBJECTAGG(a, b) |
+----------------------------------------+
| {"1":"Hello", "1":"World", "2":"This"} |
+----------------------------------------+
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