要将大型JSON数组转置为Amazon Redshift中的表格,可以使用以下解决方法。
json_array的表格,用于存储原始的JSON数组数据。CREATE TABLE json_array (
id INT,
json_data JSON
);
json_array表格中。INSERT INTO json_array (id, json_data)
VALUES (1, '[{"name": "John", "age": 25}, {"name": "Jane", "age": 30}, {"name": "Mike", "age": 35}]');
transposed_table的表格,用于存储转置后的数据。CREATE TABLE transposed_table (
id INT,
name VARCHAR(50),
age INT
);
transposed_table表格中。CREATE OR REPLACE PROCEDURE transpose_json_array()
AS $$
DECLARE
json_record JSON;
json_id INT;
BEGIN
FOR json_record IN SELECT json_data, id FROM json_array
LOOP
json_id := json_record->>'id';
INSERT INTO transposed_table (id, name, age)
SELECT json_id, (json_element->>'name')::VARCHAR(50), (json_element->>'age')::INT
FROM json_array, LATERAL json_array_elements(json_record->'json_data') AS json_element;
END LOOP;
END;
$$ LANGUAGE plpgsql;
transposed_table表格中。CALL transpose_json_array();
transposed_table表格来查看转置后的数据。SELECT * FROM transposed_table;
这样,您就可以将大型的JSON数组转置为Redshift中的表格。请注意,这个解决方法假设您已经在Amazon Redshift中创建了相关的表格。