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我正在尝试编写一个复杂的 SQL 查询，但无法获得具有正确值的结果集。

  • coupons桌子上有一些在线优惠券。
  • merchants表保存商家信息并coupons与coupons.merchant_id.
  • brancheslat表用和lng值保存商家的分支（计算距离和最近的分支等）并用 绑定到merchants表branches.merchant_id。
  • coupons_branches表关系coupons和branches表。
  • places桌子放置一些特殊的地方，如商场等，并branches用branches.place_id.

下面是我的表结构；

CREATE TABLE IF NOT EXISTS `branches` (
  `branch_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `merchant_id` int(11) unsigned NOT NULL DEFAULT '0',
  `place_id` smallint(5) unsigned NOT NULL DEFAULT '0',
  `branch` varchar(40) COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
  `address` varchar(255) COLLATE utf8_unicode_ci DEFAULT '',
  `postcode` varchar(6) COLLATE utf8_unicode_ci DEFAULT '',
  `phone` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,
  `fax` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,
  `lat` float(10,6) DEFAULT NULL,
  `lng` float(10,6) DEFAULT NULL,
  `status` tinyint(4) unsigned NOT NULL DEFAULT '1',
  PRIMARY KEY (`branch_id`),
  KEY `lat` (`lat`),
  KEY `lng` (`lng`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `coupons` (
  `coupon_id` mediumint(9) unsigned NOT NULL AUTO_INCREMENT,
  `category_id` tinyint(4) unsigned NOT NULL DEFAULT '0',
  `merchant_id` mediumint(9) unsigned NOT NULL DEFAULT '0',
  `coupon` varchar(200) COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
  `description` longtext COLLATE utf8_unicode_ci,
  `start_date` date DEFAULT NULL,
  `end_date` date DEFAULT NULL,
  `coupon_usage` int(10) unsigned NOT NULL DEFAULT '0',
  `created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `status` enum('active','passive','deleted','preview') COLLATE utf8_unicode_ci NOT NULL DEFAULT 'active',
  PRIMARY KEY (`coupon_id`),
  KEY `start_date` (`start_date`),
  KEY `end_date` (`end_date`),
  KEY `merchant_id` (`merchant_id`),
  KEY `category_id` (`category_id`),
  KEY `status` (`status`),
  KEY `created` (`created`),
  FULLTEXT KEY `description` (`description`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `coupons_branches` (
  `branch_id` int(11) unsigned NOT NULL DEFAULT '0',
  `coupon_id` int(11) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`branch_id`,`coupon_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE IF NOT EXISTS `merchants` (
  `merchant_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `merchant` varchar(80) COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
  `website` varchar(150) COLLATE utf8_unicode_ci DEFAULT NULL,
  `created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `status` enum('active','passive','deleted') COLLATE utf8_unicode_ci NOT NULL DEFAULT 'passive',
  PRIMARY KEY (`merchant_id`),
  KEY `status` (`status`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `places` (
  `place_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
  `city_id` smallint(5) unsigned NOT NULL DEFAULT '0',
  `place` varchar(150) COLLATE utf8_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`place_id`),
  KEY `place` (`place`),
  KEY `city_id` (`city_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;

这是我的 SQL；

SELECT * FROM (SELECT coupons.coupon_id AS c_id, coupons.category_id, coupons.coupon, merchants.merchant_id, merchants.merchant, (((acos(sin((41.02287686 * pi() / 180)) * sin((branches.lat * pi() / 180)) + cos((41.02287686 * pi() / 180)) * cos((branches.lat * pi()/ 180)) * cos(((29.04632806 - branches.lng) * pi() / 180)))) * 180 / pi()) * 60 * 1.1515 * 1.609344) as distance, COUNT(coupons.coupon_id) AS total_coupons
FROM (`coupons`)
INNER JOIN `coupons_branches` ON `coupons`.`coupon_id` = `coupons_branches`.`coupon_id`
RIGHT OUTER JOIN `branches` ON `coupons_branches`.`branch_id` = `branches`.`branch_id`
LEFT OUTER JOIN `merchants` ON `coupons`.`merchant_id` = `merchants`.`merchant_id`
WHERE `coupons`.`status` =  'active'
AND `merchants`.`status` =  'active'
GROUP BY `merchants`.`merchant_id`
HAVING `distance` <= 25000
ORDER BY `merchants`.`merchant`) as T2 GROUP BY c_id ORDER BY merchant

我正在尝试找出商家的总优惠券。我只想列出该商家的最新优惠券。我不想列出所有优惠券。我想先对商家进行分组，显示商家有多少优惠券。然后在另一个页面上，我将显示属于该商家的优惠券。

total_coupons除了列，一切都很好。总优惠券列未正确计算。如果我在下面写下类似的内容，它会正确计算。

SELECT * FROM (SELECT coupons.coupon_id, coupons.coupon_id AS c_id, coupons.category_id, coupons.coupon, merchants.merchant_id, merchants.merchant, coupons.coupon_usage, COUNT(coupons.coupon_id) AS total_coupons
FROM (`coupons`)
LEFT OUTER JOIN `merchants` ON `coupons`.`merchant_id` = `merchants`.`merchant_id`
WHERE `coupons`.`status` =  'active'
AND `merchants`.`status` =  'active'
GROUP BY `merchants`.`merchant_id`
ORDER BY `merchants`.`merchant`) as T2 GROUP BY c_id ORDER BY merchant

branches和表有问题，places但我找不到。

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1 回答 1

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Try by changing the COUNT() expression to COUNT(DISTINCT coupons.coupon_id). Without the DISTINCT keyword, even duplicate coupons are being counted into the total sum of merchant's coupons. I'm guessing you're looking only for the sum of coupons currently distributed to branches.

于 2012-04-26T12:36:35.543 回答