首先，对于问题的标题，我真的不知道我可以给它起什么标题。有什么建议吗？
无论如何，我正在创建一个新闻源类型的网站，显示您关注的网络和关注同一网络的用户的帖子和状态更新。
我当前的sql查询是
SELECT companyname,post_content,forename,surname,date,type,postertype
FROM cheddar.usernetworks un
LEFT JOIN cheddar.feed f ON f.posterid = un.networkid OR f.posterid = un.userid
LEFT JOIN cheddar.users u ON u.userID = f.posterid AND postertype = 'user'
LEFT JOIN cheddar.networks n ON n.id = f.posterid AND postertype = 'network'
WHERE un.userid = '9'
ORDER BY date DESC
正如我提到的，我的目标是显示网络本身的结果(帖子)以及与登录该站点的用户遵循相同网络的用户。 (我已将 9 作为测试查询中的用户 ID)。
目前它只显示来自用户 9 和网络的帖子，但没有来自用户 6 的帖子。
有什么想法吗？我已经尝试了 2 个小时的各种不同的东西，这是我想出的最后一件事。
用于提要表的 SQL
CREATE TABLE `feed` (
`postid` int(11) NOT NULL AUTO_INCREMENT,
`posterid` int(11) DEFAULT NULL,
`post_content` mediumtext,
`date` varchar(45) DEFAULT NULL,
`type` varchar(45) DEFAULT NULL,
`postertype` varchar(45) DEFAULT NULL,
PRIMARY KEY (`postid`)
) ENGINE=InnoDB AUTO_INCREMENT=26 DEFAULT CHARSET=latin1;
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (1,9,'hello! meow!','1516889612','update','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (2,10293,'we are the peaky blinders','1516889612','update','network');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (3,9,'Earned a new badge!','1516901430','badge','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (4,9,'Top Seller','1516901430','topseller','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (5,9,' dddd','1516909119','update','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (6,9,' lol','1516909164','update','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (7,9,' haha','1516909214','update','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (8,9,'Why is GOD so great?','1516909574','question','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (9,9,' Coffee is for closers!','1516909968','tip','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (18,9,' lol','1516915928','update','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (19,9,' meow','1516916436','update','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (20,9,' Haha! Was that you?!','1516916487','update','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (21,10295,'Sell wine! It\'s not a crime','1516916905','update','network');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (22,42,'I love women and sales!','1516916905','update','user');
INSERT INTO `feed` (`postid`,`posterid`,`post_content`,`date`,`type`,`postertype`) VALUES (25,9,' is mo a bad boy','1516926061','question','user');
SQL FOR 用户网络
CREATE TABLE `usernetworks` (
`id` int(11) NOT NULL,
`userID` int(11) DEFAULT NULL,
`networkid` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
*/
INSERT INTO `usernetworks` (`id`,`userID`,`networkid`) VALUES (1,9,10293);
INSERT INTO `usernetworks` (`id`,`userID`,`networkid`) VALUES (4,42,10293);
INSERT INTO `usernetworks` (`id`,`userID`,`networkid`) VALUES (5,3,10293);
INSERT INTO `usernetworks` (`id`,`userID`,`networkid`) VALUES (8,6,10295);
最佳答案
我想这就是你想要的:
Results :
| id | userID | networkid |
|----|--------|-----------|
| 1 | 9 | 10293 |
| 4 | 42 | 10293 |
| 5 | 3 | 10293 |
| 8 | 6 | 10295 |
查询 2:
SELECT f.*, post_content,date,type,postertype
FROM usernetworks un
LEFT JOIN feed f ON f.posterid = un.networkid OR f.posterid = un.userid
WHERE un.userid in (
select u1.userID
from usernetworks u1
inner join usernetworks u2 on u1.networkid = u2.networkid
where u2.userID = 9
)
ORDER BY date DESC
Results :
| postid | posterid | post_content | date | type | postertype | post_content | date | type | postertype |
|--------|----------|---------------------------|------------|-----------|------------|---------------------------|------------|-----------|------------|
| 25 | 9 | is mo a bad boy | 1516926061 | question | user | is mo a bad boy | 1516926061 | question | user |
| 22 | 42 | I love women and sales! | 1516916905 | update | user | I love women and sales! | 1516916905 | update | user |
| 20 | 3 | Haha! Was that you?! | 1516916487 | update | user | Haha! Was that you?! | 1516916487 | update | user |
| 19 | 9 | meow | 1516916436 | update | user | meow | 1516916436 | update | user |
| 18 | 9 | lol | 1516915928 | update | user | lol | 1516915928 | update | user |
| 9 | 9 | Coffee is for closers! | 1516909968 | tip | user | Coffee is for closers! | 1516909968 | tip | user |
| 8 | 9 | Why is GOD so great? | 1516909574 | question | user | Why is GOD so great? | 1516909574 | question | user |
| 7 | 9 | haha | 1516909214 | update | user | haha | 1516909214 | update | user |
| 6 | 9 | lol | 1516909164 | update | user | lol | 1516909164 | update | user |
| 5 | 9 | dddd | 1516909119 | update | user | dddd | 1516909119 | update | user |
| 3 | 9 | Earned a new badge! | 1516901430 | badge | user | Earned a new badge! | 1516901430 | badge | user |
| 4 | 9 | Top Seller | 1516901430 | topseller | user | Top Seller | 1516901430 | topseller | user |
| 1 | 9 | hello! meow! | 1516889612 | update | user | hello! meow! | 1516889612 | update | user |
| 2 | 10293 | we are the peaky blinders | 1516889612 | update | network | we are the peaky blinders | 1516889612 | update | network |
| 2 | 10293 | we are the peaky blinders | 1516889612 | update | network | we are the peaky blinders | 1516889612 | update | network |
| 2 | 10293 | we are the peaky blinders | 1516889612 | update | network | we are the peaky blinders | 1516889612 | update | network |
关于mysql - 显示用户关注相同 ID 的结果，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48453910/