我遇到了一个我有点神秘的SQL问题。我有两个不同的 关于这个问题的问题:
以下查询:
SELECT subs.date_added,subs.subscribed_to,users.userid, users.username, users.email, users.avatar, users.fbuid, users.level, users.avatar_url, users.sex, users.dob, users.profile_hits, users.total_videos, users.subscribers, users.doj, users.extras, users.first_name, users.last_name, users.ban_status, users.usr_status, users.last_logged, users.country, users.user_filter_level, users.signup_ip, subs.userid as subscriber
FROM cb_subscriptions as subs
LEFT JOIN cb_users AS users
ON subs.userid=users.userid
WHERE subs.subscribed_to ='2960'
GROUP BY subs.subscribed_to ,subs.userid
ORDER BY subs.date_added ASC
LIMIT 8;
...产生以下错误:
ERROR: column "users.userid" must appear in the GROUP BY clause or be used in an aggregate function
该字段是CHAR
,所以我不确定要使用哪种聚合,
或者(对我的理解更重要)为什么有必要。
正如我所说,我不确定我理解为什么会这样。我假设我
不理解group by
以及我以为我做过;)
这不是我的查询,我正在将MySQL中的原型系统翻译成 PostgreSQL的。此查询 在MySql中工作。这是否构成一个 MySql中的错误,或PostgreSQL的缺点,或者只是差异 解释
当我在group by
条款中添加此列时,它正在运行,但我不明白为什么?
SELECT subs.date_added, users.userid, users.username, users.email,
users.avatar, users.fbuid, users.level, users.avatar_url,
users.sex, users.dob, users.profile_hits, users.total_videos,
users.subscribers, users.doj, users.extras, users.first_name,
users.last_name, users.ban_status, users.usr_status,
users.last_logged, users.country, users.user_filter_level,
users.signup_ip, subs.userid as subscriber
FROM cb_subscriptions as subs
LEFT JOIN cb_users AS users
ON subs.userid=users.userid
WHERE subs.subscribed_to ='2960'
GROUP BY users.userid,
subs.subscribed_to,
subs.userid,
subs.date_added
ORDER BY subs.date_added ASC
LIMIT 8;
CREATE TABLE `cb_subscriptions` (
`subscription_id` int(225) NOT NULL,
`userid` int(11) NOT NULL,
`subscribed_to` mediumtext NOT NULL,
`date_added` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
ALTER TABLE `cb_subscriptions`
ADD PRIMARY KEY (`subscription_id`);
ALTER TABLE `cb_subscriptions`
MODIFY `subscription_id` int(225) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1
CREATE TABLE `cb_users` (
`userid` bigint(20) NOT NULL,
`fbuid` varchar(225) NOT NULL,
`category` int(20) NOT NULL,
`username` varchar(50) NOT NULL,
`first_name` varchar(200) NOT NULL,
`last_name` varchar(200) NOT NULL,
`user_session_key` varchar(32) NOT NULL,
`user_session_code` int(5) NOT NULL,
`password` varchar(40) NOT NULL DEFAULT '',
`email` varchar(80) NOT NULL DEFAULT '',
`usr_status` enum('Ok','ToActivate') NOT NULL DEFAULT 'ToActivate',
`msg_notify` enum('yes','no') NOT NULL DEFAULT 'yes',
`avatar` varchar(225) NOT NULL DEFAULT '',
`avatar_url` text NOT NULL,
`sex` enum('male','female') NOT NULL DEFAULT 'male',
`dob` date NOT NULL DEFAULT '0000-00-00',
`country` varchar(20) NOT NULL DEFAULT 'PK',
`level` int(6) NOT NULL DEFAULT '2',
`avcode` varchar(32) NOT NULL,
`doj` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`last_logged` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
`num_visits` bigint(20) NOT NULL DEFAULT '0',
`session` varchar(32) NOT NULL DEFAULT '',
`ip` varchar(15) NOT NULL DEFAULT '',
`signup_ip` varchar(15) NOT NULL DEFAULT '',
`time_zone` tinyint(4) NOT NULL DEFAULT '0',
`featured` enum('No','Yes') NOT NULL DEFAULT 'No',
`featured_date` datetime NOT NULL,
`profile_hits` bigint(20) DEFAULT '0',
`total_watched` bigint(20) NOT NULL DEFAULT '0',
`total_videos` bigint(20) NOT NULL,
`total_comments` bigint(20) NOT NULL,
`total_photos` bigint(255) NOT NULL,
`total_collections` bigint(255) NOT NULL,
`comments_count` bigint(20) NOT NULL,
`last_commented` datetime NOT NULL,
`voted` text NOT NULL,
`likes` decimal(5,0) NOT NULL,
`likes_count` int(6) NOT NULL,
`ban_status` enum('yes','no') NOT NULL DEFAULT 'no',
`upload` varchar(20) NOT NULL DEFAULT '1',
`subscribers` bigint(225) NOT NULL DEFAULT '0',
`total_subscriptions` bigint(255) NOT NULL,
`background` mediumtext NOT NULL,
`background_color` varchar(25) NOT NULL,
`background_url` text NOT NULL,
`background_repeat` enum('no-repeat','repeat','repeat-x','repeat-y') NOT NULL DEFAULT 'repeat',
`background_attachement` enum('yes','no') NOT NULL DEFAULT 'no',
`total_groups` bigint(20) NOT NULL,
`last_active` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`banned_users` text NOT NULL,
`welcome_email_sent` enum('yes','no') NOT NULL DEFAULT 'no',
`total_downloads` bigint(255) NOT NULL,
`is_subscribed` enum('yes','no') NOT NULL DEFAULT 'no',
`album_privacy` enum('public','private','friends') NOT NULL DEFAULT 'private',
`extras` text NOT NULL,
`user_filter_level` int(1) NOT NULL DEFAULT '0'
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
ALTER TABLE `cb_users`
ADD PRIMARY KEY (`userid`),
ADD KEY `ind_status_doj` (`doj`),
ADD KEY `ind_status_id` (`userid`),
ADD KEY `ind_hits_doj` (`profile_hits`,`doj`),
ADD KEY `username` (`username`);
答案 0 :(得分:1)