//Query the data of a table within half a year
SELECT
concat(t1.month,"月") as signingMonth,
IFNULL(count(1),0) AS signingNum
FROM
(
SELECT MONTH(DATE_FORMAT(CURDATE(), '%Y-%m-%h')) as month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 1 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 2 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 3 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 4 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 5 MONTH), '%Y-%m-%h')) AS month
) t1
LEFT JOIN test_signing AS ts ON (
MONTH(DATE_FORMAT(ts.create_time, '%Y-%m-%h'))= t1.month and YEAR(ts.create_time)=YEAR(NOW())
)
GROUP BY t1.month
//Multiple tables query the data within half a year and then merge
select a.month1 as month,a.totalElectricElectricity,b.totalChargingElectricity
FROM (SELECT
concat(t1.month,"月") as month1,
IFNULL(SUM(ts.electricity),0) AS totalElectricElectricity
FROM
(
SELECT MONTH(DATE_FORMAT(CURDATE(), '%Y-%m-%h')) as month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 1 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 2 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 3 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 4 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 5 MONTH), '%Y-%m-%h')) AS month
) t1
LEFT JOIN test_car_statistical AS ts ON (
MONTH(DATE_FORMAT(ts.create_time, '%Y-%m-%h'))= t1.month and ts.type=1 and YEAR(ts.create_time)=YEAR(NOW())
)
GROUP BY t1.month) as a
LEFT JOIN
(
SELECT concat(t2.month,"月") as month2,IFNULL(SUM(tc.electricity),0) AS totalChargingElectricity
FROM(
SELECT MONTH(DATE_FORMAT(CURDATE(), '%Y-%m-%h')) as month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 1 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 2 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 3 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 4 MONTH), '%Y-%m-%h')) AS month
UNION SELECT MONTH(DATE_FORMAT((CURDATE() - INTERVAL 5 MONTH), '%Y-%m-%h')) AS month
) t2
LEFT JOIN test_car_statistical AS tc ON (
MONTH(DATE_FORMAT(tc.create_time, '%Y-%m-%h'))= t2.month and tc.type=2 and YEAR(tc.create_time)=YEAR(NOW())
)
GROUP BY t2.month
) as b
ON b.month2=a.month1
effect
