MySQL多个group_concat，每月计数

Question

我有一个MySQL表（place_analytics），我想使用group_concat按地址获取每月的计数，

我试过了，

SELECT place_id,
GROUP_CONCAT(
    DISTINCT MONTHNAME(STR_TO_DATE(MONTH(created_at), '%m'))
) AS months,
COUNT(*) AS place_count
FROM place_analytics
GROUP BY place_id

这给了我几乎正确的结果，

如果你查看第三行，即

place_id | months      | place_count
4        | July, June  | 2

计数是我所有月份的总和：7月，6月。

问题： 有没有办法让我每个月都能使用group_concat来计算，如下所示，

place_id | months      | place_count
4        | July, June  | 1,1

或者这种格式也可以，

place_id | months_and_count
4        | July,1 SEPARATOR June,1





CREATE TABLE `place_analytics` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `place_id` int(11) NOT NULL,
  `user_id` int(11) DEFAULT NULL,
  `is_followed` tinyint(4) NOT NULL DEFAULT '0',
  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

-- ----------------------------
-- Records of place_analytics
-- ----------------------------
INSERT INTO `place_analytics` VALUES ('1', '10', '6', '0', '2017-06-01 15:45:04');
INSERT INTO `place_analytics` VALUES ('2', '98', '1', '1', '2017-06-01 15:45:39');
INSERT INTO `place_analytics` VALUES ('3', '98', '3', '1', '2017-06-01 15:46:24');
INSERT INTO `place_analytics` VALUES ('4', '10', '5', '1', '2017-06-01 17:51:27');
INSERT INTO `place_analytics` VALUES ('5', '98', '5', '1', '2017-06-01 17:53:48');
INSERT INTO `place_analytics` VALUES ('6', '98', '5', '1', '2017-06-08 15:43:27');
INSERT INTO `place_analytics` VALUES ('7', '1', '5', '1',  '2017-06-08 15:47:56');
INSERT INTO `place_analytics` VALUES ('8', '2', '5', '1',  '2017-06-08 16:00:43');
INSERT INTO `place_analytics` VALUES ('9', '4', '5', '1',  '2017-06-09 16:21:19');
INSERT INTO `place_analytics` VALUES ('10', '4', '2', '1', '2017-07-13 14:29:45');

Answer 1

SELECT Z.place_id,GROUP_CONCAT(Z.place_count),GROUP_CONCAT(Z.months) months
FROM
(
    SELECT place_id,
    GROUP_CONCAT(
        DISTINCT MONTHNAME(STR_TO_DATE(MONTH(created_at), '%m'))
    ) AS months,
    COUNT(*) AS place_count
    FROM place_analytics
    GROUP BY place_id,MONTHNAME(STR_TO_DATE(MONTH(created_at), '%m'))
)Z
GROUP BY place_id

尝试以上查询。

Answer 2

尝试以下查询：

SELECT p.place_id,
GROUP_CONCAT(
    DISTINCT MONTHNAME(STR_TO_DATE(MONTH(p.created_at), '%m'))
) AS months,
(SELECT GROUP_CONCAT(cnt) FROM (
    SELECT COUNT(*) AS cnt FROM place_analytics GROUP BY place_id, MONTH(created_at)
) a)  AS place_count
FROM place_analytics p
GROUP BY place_id;

这里是 SQL Fiddle 。