JSON_ARRAY_AGG

引入或更新: v1.2.595

将值转换为 JSON 数组，同时跳过 NULL 值。

另请参阅: JSON_OBJECT_AGG

语法

JSON_ARRAY_AGG(<expr>)

返回类型

JSON 数组。

示例

此示例演示了 JSON_ARRAY_AGG 如何将每一列的值聚合为 JSON 数组：

CREATE TABLE d (
    a DECIMAL(10, 2), 
    b STRING, 
    c INT, 
    d VARIANT, 
    e ARRAY(STRING)
);

INSERT INTO d VALUES
    (20, 'abc', NULL, '{"k":"v"}', ['a','b']),
    (10, 'de', 100, 'null', []),
    (4.23, NULL, 200, '"uvw"', ['x','y']),
    (5.99, 'xyz', 300, '[1,2,3]', ['z']);

SELECT 
    json_array_agg(a) AS aggregated_a, 
    json_array_agg(b) AS aggregated_b, 
    json_array_agg(c) AS aggregated_c, 
    json_array_agg(d) AS aggregated_d, 
    json_array_agg(e) AS aggregated_e
FROM d;

-[ RECORD 1 ]-----------------------------------
aggregated_a: [20.0,10.0,4.23,5.99]
aggregated_b: ["abc","de","xyz"]
aggregated_c: [100,200,300]
aggregated_d: [{"k":"v"},null,"uvw",[1,2,3]]
aggregated_e: [["a","b"],[],["x","y"],["z"]]