Question

我一直试图想出这个问题几个小时，但我无法理解为什么它不起作用。

我有一个MySQL查询，如下所示：

SELECT
    *,
    COUNT(Schedule.id) AS schedule_count,
    GetDistance(49.0134297, 12.1016236, Provider.latitude, Provider.longitude) AS distance,
    Provider.gps_modified >= DATE_SUB(NOW(), INTERVAL 180 MINUTE) AS valid_gps,
    `Provider`.`id`
FROM `db`.`providers` AS `Provider` 
LEFT JOIN `availapple`.`employments` AS `Employment` ON (`Provider`.`employment_id` = `Employment`.`id`)
INNER JOIN `db`.`certificates_providers` AS `CertProv` ON (`CertProv`.`provider_id` = `Provider`.`id`)
INNER JOIN `db`.`schedules` AS `Schedule` ON (`Schedule`.`provider_id` = 
`Provider`.`id`)
WHERE `Provider`.`id` IN (1, 19, 23, 28, 48, 63, 96, 97, 126, 128, 150, 157, 172)
AND `Provider`.`last_login` >= DATE_SUB(NOW(), INTERVAL 180000 MINUTE)
ORDER BY `Provider`.`activity_points` DESC, `schedule_count` DESC
LIMIT 10

有10个提供程序符合WHERE子句中指定的条件，但是我只得到一个结果。如果我摆脱COUNT(Schedule.id) AS schedule_count 但它会返回所有10个结果。

Answer 1

您应该按Provider添加该群组。id

这样

SELECT
    *,
    COUNT(Schedule.id) AS schedule_count,
    GetDistance(49.0134297, 12.1016236, Provider.latitude, Provider.longitude) AS distance,
    Provider.gps_modified >= DATE_SUB(NOW(), INTERVAL 180 MINUTE) AS valid_gps,
    `Provider`.`id`
FROM `db`.`providers` AS `Provider` 
LEFT JOIN `availapple`.`employments` AS `Employment` ON (`Provider`.`employment_id` = `Employment`.`id`)
INNER JOIN `db`.`certificates_providers` AS `CertProv` ON (`CertProv`.`provider_id` = `Provider`.`id`)
INNER JOIN `db`.`schedules` AS `Schedule` ON (`Schedule`.`provider_id` = 
`Provider`.`id`)
WHERE `Provider`.`id` IN (1, 19, 23, 28, 48, 63, 96, 97, 126, 128, 150, 157, 172)
AND `Provider`.`last_login` >= DATE_SUB(NOW(), INTERVAL 180000 MINUTE)
group by  `Provider`.`id`
ORDER BY `Provider`.`activity_points` DESC, `schedule_count` DESC
LIMIT 10

MySql COUNT（）as字段只返回一个条目

1 个答案: