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CREATE TABLE data(
device INT NOT NULL,
date DATETIME NOT NULL,
metric NUMERIC(10,2) NOT NULL
);
INSERT INTO data VALUES (1, '2022-01-01 00:00:00', 2.34),
(2, '2022-01-01 00:00:00', 1.23),
(3, '2022-01-01 00:00:00', 3.82),
(4, '2022-01-01 00:00:00', 0.45),
(1, '2022-01-01 01:00:00', 2.00),
(2, '2022-01-01 01:00:00', 1.82),
(3, '2022-01-01 01:00:00', 3.09);
SELECT date, SUM(d1), SUM(d2), SUM(d3), SUM(d4) FROM (
SELECT date,
CASE WHEN device=1 THEN metric ELSE NULL END AS d1,
CASE WHEN device=2 THEN metric ELSE NULL END AS d2,
CASE WHEN device=3 THEN metric ELSE NULL END AS d3,
CASE WHEN device=4 THEN metric ELSE NULL END AS d4
FROM data
) nested
GROUP BY date;
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