如何计算所有超过一定数量的 DISTINCT ID 组，然后返回这些 ID？

问题描述 投票：0回答：1

简介：

我想为用户可以参加的技术测试次数设置限制。一旦超过该限制，我想删除剩余的部分，这将代表最早提交的技术测试。 先进先出类型的系统。

详情：

MySQL 5.5

使用以下 SQL：

/*
Navicat MySQL Data Transfer

Source Server         : local
Source Server Version : 50562
Source Host           : localhost:3306
Source Database       : devtester-blog

Target Server Type    : MYSQL
Target Server Version : 50562
File Encoding         : 65001

Date: 2024-01-08 20:50:01
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for tbluserquestion
-- ----------------------------
DROP TABLE IF EXISTS `tbluserquestion`;
CREATE TABLE `tbluserquestion` (
  `UserQuestion_ID` int(11) NOT NULL AUTO_INCREMENT,
  `User_ID` int(11) DEFAULT NULL,
  `Question_ID` int(11) DEFAULT NULL,
  `Technical_test_uuid` varchar(255) DEFAULT NULL,
  `Answer_text` longtext,
  `Duration` int(11) DEFAULT '10',
  `Submission_date` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`UserQuestion_ID`)
) ENGINE=InnoDB AUTO_INCREMENT=1663 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of tbluserquestion
-- ----------------------------
INSERT INTO `tbluserquestion` VALUES ('23', '1', '36', '6f21885b-fe56-0a35-3dd181707f656b08', '', '10', '2023-10-17 16:44:28');
INSERT INTO `tbluserquestion` VALUES ('24', '1', '37', '6f21885b-fe56-0a35-3dd181707f656b08', '', '10', '2023-10-17 16:44:28');
INSERT INTO `tbluserquestion` VALUES ('25', '1', '43', '6f21885b-fe56-0a35-3dd181707f656b08', '', '10', '2023-10-17 16:44:28');
INSERT INTO `tbluserquestion` VALUES ('26', '1', '41', '6f21885b-fe56-0a35-3dd181707f656b08', 'async', '10', '2023-10-17 16:44:28');
INSERT INTO `tbluserquestion` VALUES ('27', '1', '38', '6f34ce31-987b-cb1e-a676985c54114a46', '', '10', '2023-10-17 16:46:34');
INSERT INTO `tbluserquestion` VALUES ('28', '1', '40', '6f34ce31-987b-cb1e-a676985c54114a46', '', '10', '2023-10-17 16:46:34');
INSERT INTO `tbluserquestion` VALUES ('29', '1', '41', '6f34ce31-987b-cb1e-a676985c54114a46', 'asyncXXXX', '10', '2023-10-17 16:46:34');
INSERT INTO `tbluserquestion` VALUES ('30', '1', '42', '6f34ce31-987b-cb1e-a676985c54114a46', '', '10', '2023-10-17 16:46:34');
INSERT INTO `tbluserquestion` VALUES ('31', '1', '45', '6f34ce31-987b-cb1e-a676985c54114a46', '', '10', '2023-10-17 16:46:34');
INSERT INTO `tbluserquestion` VALUES ('44', '1', '37', 'ff38ad50-e835-447a-49e220375e3f7769', '', '10', '2023-10-25 11:12:37');
INSERT INTO `tbluserquestion` VALUES ('45', '1', '39', 'ff38ad50-e835-447a-49e220375e3f7769', '', '10', '2023-10-25 11:12:37');
INSERT INTO `tbluserquestion` VALUES ('46', '1', '40', 'ff38ad50-e835-447a-49e220375e3f7769', '', '10', '2023-10-25 11:12:37');
INSERT INTO `tbluserquestion` VALUES ('47', '1', '42', 'ff38ad50-e835-447a-49e220375e3f7769', '', '10', '2023-10-25 11:12:37');
INSERT INTO `tbluserquestion` VALUES ('48', '1', '43', 'ff38ad50-e835-447a-49e220375e3f7769', '', '10', '2023-10-25 11:12:37');
INSERT INTO `tbluserquestion` VALUES ('188', '1', '43', 'ac9dad15-f677-8816-50eba2056f77e9ce', '', '10', '2023-12-22 11:22:01');
INSERT INTO `tbluserquestion` VALUES ('189', '1', '45', 'ac9dad15-f677-8816-50eba2056f77e9ce', '', '10', '2023-12-22 11:22:01');
INSERT INTO `tbluserquestion` VALUES ('190', '1', '47', 'ac9dad15-f677-8816-50eba2056f77e9ce', '', '10', '2023-12-22 11:22:01');
INSERT INTO `tbluserquestion` VALUES ('191', '1', '46', 'ac9dad15-f677-8816-50eba2056f77e9ce', '', '10', '2023-12-22 11:22:01');
INSERT INTO `tbluserquestion` VALUES ('192', '1', '42', 'ac9dad15-f677-8816-50eba2056f77e9ce', '', '10', '2023-12-22 11:22:01');
INSERT INTO `tbluserquestion` VALUES ('193', '1', '43', 'acafb668-aa4a-fa1e-a91ab2a0f6005d7f', '', '10', '2023-12-22 11:23:59');
INSERT INTO `tbluserquestion` VALUES ('194', '1', '42', 'acafb668-aa4a-fa1e-a91ab2a0f6005d7f', '', '10', '2023-12-22 11:23:59');
INSERT INTO `tbluserquestion` VALUES ('195', '1', '44', 'acafb668-aa4a-fa1e-a91ab2a0f6005d7f', 'nav', '10', '2023-12-22 11:23:59');
INSERT INTO `tbluserquestion` VALUES ('196', '1', '45', 'acafb668-aa4a-fa1e-a91ab2a0f6005d7f', '', '10', '2023-12-22 11:23:59');
INSERT INTO `tbluserquestion` VALUES ('197', '1', '46', 'acafb668-aa4a-fa1e-a91ab2a0f6005d7f', '', '10', '2023-12-22 11:23:59');
INSERT INTO `tbluserquestion` VALUES ('198', '1', '46', 'acbe4c54-974e-5a75-fd0a74fb06c69171', '', '10', '2023-12-22 11:25:34');
INSERT INTO `tbluserquestion` VALUES ('199', '1', '47', 'acbe4c54-974e-5a75-fd0a74fb06c69171', '', '10', '2023-12-22 11:25:34');
INSERT INTO `tbluserquestion` VALUES ('200', '1', '45', 'acbe4c54-974e-5a75-fd0a74fb06c69171', '', '10', '2023-12-22 11:25:34');
INSERT INTO `tbluserquestion` VALUES ('201', '1', '44', 'acbe4c54-974e-5a75-fd0a74fb06c69171', 'nav', '10', '2023-12-22 11:25:34');
INSERT INTO `tbluserquestion` VALUES ('202', '1', '42', 'acbe4c54-974e-5a75-fd0a74fb06c69171', '', '10', '2023-12-22 11:25:35');
INSERT INTO `tbluserquestion` VALUES ('733', '1', '37', '14c7e6ed-ff42-110b-dc4cbaa2e34f80c5', '', '10', '2023-12-24 11:54:33');
INSERT INTO `tbluserquestion` VALUES ('734', '1', '36', '14c7e6ed-ff42-110b-dc4cbaa2e34f80c5', '', '10', '2023-12-24 11:54:33');
INSERT INTO `tbluserquestion` VALUES ('735', '1', '41', '14c7e6ed-ff42-110b-dc4cbaa2e34f80c5', 'nav', '10', '2023-12-24 11:54:33');
INSERT INTO `tbluserquestion` VALUES ('736', '1', '39', '14c7e6ed-ff42-110b-dc4cbaa2e34f80c5', '', '10', '2023-12-24 11:54:33');
INSERT INTO `tbluserquestion` VALUES ('737', '1', '38', '14c7e6ed-ff42-110b-dc4cbaa2e34f80c5', '', '10', '2023-12-24 11:54:33');
INSERT INTO `tbluserquestion` VALUES ('738', '1', '40', '14d8c247-fa69-7dff-72fc601dadb06df9', '', '10', '2023-12-24 11:56:23');
INSERT INTO `tbluserquestion` VALUES ('739', '1', '38', '14d8c247-fa69-7dff-72fc601dadb06df9', '', '10', '2023-12-24 11:56:23');
INSERT INTO `tbluserquestion` VALUES ('740', '1', '39', '14d8c247-fa69-7dff-72fc601dadb06df9', '', '10', '2023-12-24 11:56:23');
INSERT INTO `tbluserquestion` VALUES ('741', '1', '36', '14d8c247-fa69-7dff-72fc601dadb06df9', '', '10', '2023-12-24 11:56:23');
INSERT INTO `tbluserquestion` VALUES ('742', '1', '41', '14d8c247-fa69-7dff-72fc601dadb06df9', 'async', '10', '2023-12-24 11:56:23');
INSERT INTO `tbluserquestion` VALUES ('1198', '1', '40', 'eba21284-9a25-dbbf-748ab2a62aa3e314', '', '10', '2024-01-02 15:20:02');
INSERT INTO `tbluserquestion` VALUES ('1199', '1', '37', 'eba21284-9a25-dbbf-748ab2a62aa3e314', '', '10', '2024-01-02 15:20:02');
INSERT INTO `tbluserquestion` VALUES ('1200', '1', '38', 'eba21284-9a25-dbbf-748ab2a62aa3e314', '', '10', '2024-01-02 15:20:02');
INSERT INTO `tbluserquestion` VALUES ('1201', '1', '39', 'eba21284-9a25-dbbf-748ab2a62aa3e314', '', '10', '2024-01-02 15:20:02');
INSERT INTO `tbluserquestion` VALUES ('1202', '1', '41', 'eba21284-9a25-dbbf-748ab2a62aa3e314', 'async', '10', '2024-01-02 15:20:02');
INSERT INTO `tbluserquestion` VALUES ('1213', '1', '41', 'effd132a-991e-e99c-236c68dc5f167090', 'async', '10', '2024-01-02 17:21:49');
INSERT INTO `tbluserquestion` VALUES ('1214', '1', '39', 'effd132a-991e-e99c-236c68dc5f167090', '', '10', '2024-01-02 17:21:49');
INSERT INTO `tbluserquestion` VALUES ('1215', '1', '38', 'effd132a-991e-e99c-236c68dc5f167090', '', '10', '2024-01-02 17:21:49');
INSERT INTO `tbluserquestion` VALUES ('1216', '1', '37', 'effd132a-991e-e99c-236c68dc5f167090', '', '10', '2024-01-02 17:21:49');
INSERT INTO `tbluserquestion` VALUES ('1217', '1', '36', 'effd132a-991e-e99c-236c68dc5f167090', '', '10', '2024-01-02 17:21:49');
INSERT INTO `tbluserquestion` VALUES ('1218', '1', '39', 'f01edf85-c805-dfa1-c0f9d8ece9b2bf20', '', '10', '2024-01-02 17:25:31');
INSERT INTO `tbluserquestion` VALUES ('1219', '1', '36', 'f01edf85-c805-dfa1-c0f9d8ece9b2bf20', '', '10', '2024-01-02 17:25:31');
INSERT INTO `tbluserquestion` VALUES ('1220', '1', '38', 'f01edf85-c805-dfa1-c0f9d8ece9b2bf20', '', '10', '2024-01-02 17:25:31');
INSERT INTO `tbluserquestion` VALUES ('1221', '1', '37', 'f01edf85-c805-dfa1-c0f9d8ece9b2bf20', '', '10', '2024-01-02 17:25:31');
INSERT INTO `tbluserquestion` VALUES ('1222', '1', '41', 'f01edf85-c805-dfa1-c0f9d8ece9b2bf20', 'async', '10', '2024-01-02 17:25:31');
INSERT INTO `tbluserquestion` VALUES ('1313', '1', '45', 'f535c6d7-c4c9-1006-ef99f2bffb0df9d7', '', '10', '2024-01-02 19:47:49');
INSERT INTO `tbluserquestion` VALUES ('1314', '1', '47', 'f535c6d7-c4c9-1006-ef99f2bffb0df9d7', '', '10', '2024-01-02 19:47:49');
INSERT INTO `tbluserquestion` VALUES ('1315', '1', '42', 'f535c6d7-c4c9-1006-ef99f2bffb0df9d7', '', '10', '2024-01-02 19:47:49');
INSERT INTO `tbluserquestion` VALUES ('1316', '1', '46', 'f535c6d7-c4c9-1006-ef99f2bffb0df9d7', '', '10', '2024-01-02 19:47:49');
INSERT INTO `tbluserquestion` VALUES ('1317', '1', '43', 'f535c6d7-c4c9-1006-ef99f2bffb0df9d7', '', '10', '2024-01-02 19:47:49');
INSERT INTO `tbluserquestion` VALUES ('1328', '1', '46', 'f57b0d9a-972a-61c3-84f7bc1463a71124', '', '10', '2024-01-02 19:55:23');
INSERT INTO `tbluserquestion` VALUES ('1329', '1', '45', 'f57b0d9a-972a-61c3-84f7bc1463a71124', '', '10', '2024-01-02 19:55:23');
INSERT INTO `tbluserquestion` VALUES ('1330', '1', '44', 'f57b0d9a-972a-61c3-84f7bc1463a71124', 'nav', '10', '2024-01-02 19:55:23');
INSERT INTO `tbluserquestion` VALUES ('1331', '1', '42', 'f57b0d9a-972a-61c3-84f7bc1463a71124', '', '10', '2024-01-02 19:55:23');
INSERT INTO `tbluserquestion` VALUES ('1332', '1', '43', 'f57b0d9a-972a-61c3-84f7bc1463a71124', '', '10', '2024-01-02 19:55:23');
SET FOREIGN_KEY_CHECKS=1;

目标：

如果不同的Technical_test_uuid的数量大于10，我如何编写一个返回N个不同的Technical_test_uuid的SQL查询。因此，如果有13组Technical_test_uuid，那么3个不同的Technical_test_uuid将是被退回。这 3 条记录将代表 Submission_date 之前最早的 Technical_test_uuid

此表中有 13 个不同的 Technical_test_uuids 组。

查询：

这是我的尝试：

SELECT Technical_test_uuid
FROM tblUserQuestion uq 
WHERE 
    Technical_test_uuid IN (
        SELECT Technical_test_uuid  
        FROM tblUserQuestion
        WHERE User_ID = uq.User_ID AND Technical_test_uuid IN (
            SELECT DISTINCT(Technical_test_uuid)
            FROM tblUserQuestion
            WHERE User_ID = uq.User_ID
            HAVING COUNT(DISTINCT(Technical_test_uuid)) > 10
        )
    )
GROUP BY uq.Technical_test_uuid

但它只返回一个结果，而它应该返回 3

Technical_test_uuid
6f21885b-fe56-0a35-3dd181707f656b08

请理解，我想计算表中所有 DISTINCT Technical_test_uuid，而不是每组中 Technical_test_uuid 的数量？

mysql
1个回答
0
投票

你最里面的子查询是错误的。如果没有 

GROUP BY
，它只是返回带有随机选择的 
Technical_test_uuid
的单行。您想要 
GROU BY Technical_test_uuid
并获取所有计数较高的值。

SELECT Technical_test_uuid
FROM tblUserQuestion
GROUP BY Technical_test_uuid
HAVING COUNT(*) > 10
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