我正在尝试使用以下方法安装MySQL:
sudo apt install mysql-server
在这个过程的最后,我得到了以下信息:
E: Sub-process /usr/bin/dpkg returned an error code (1)
整个投入/产出:
ubuntu@ubuntu:~$ sudo apt install mysql-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages
我有以下模式
mysql> describe category;
+-------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------------------+------+-----+---------+----------------+
| id | tinyint(3) unsigned | NO | PRI | NUL
mysql> desc courses;
+--------------------+---------------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------------+---------------------------+------+-----+---------+----------------+
| c
有没有人能解释一下为什么我会看到以下行为:
mysql> show index from history_historyentry;
+----------------------+------------+------------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name
我想知道今天排队的召唤者们玩的游戏数量。我已经问过几个问题了。我最近得到的是:
SELECT
s.summoner,
s.wins,
COUNT(*) as playedToday
FROM summoners s
LEFT JOIN teams_players tp ON tp.summoner_id = s.summoner
LEFT JOIN teams t ON t.id = tp.team_id
LEFT JOIN matches b ON t.id = b.blue_id
WHERE
我写了这个查询:
$query = "UPDATE encodage_answer
SET Answer = geir
WHERE encodage_question_ID = 128
AND encodage_ID = 305
AND Extra = NULL";
$insert = mysql_query($query, $connection) or die(mysql_error());
但是,如果我运行这段代码,我总是会得到相同的错误:
“字段列表”中的未知列“
我正在制作一个简单的数据库作为一个电子商务网站的模拟例子使用。我需要做的一件事是使用PHP从数据库中删除记录。我可以删除用户名或订单等。但是,当我试图一次完成所有这些任务时,我就把事情搞砸了。我想要发生的是删除用户的所有信息。例如:用户信息、发货信息、账单信息、信用卡信息以及与特定用户有关的任何其他内容。我的表格如下。
mysql> SHOW columns FROM shirt_billing_addresses;
+----------------------------+--------------+------+-----+---------+----------------
系统版本- macOS蒙特雷(12.4)芯片-苹果M1 Pro
目标--我想根据需要使用brew安装mysql@5.6。任何其他方法也受到欢迎。
接下来的步骤-
运行安装mysql 5.6的命令(brew安装mysql@5.6)
Warning: mysql@5.6 has been deprecated because it is not supported upstream!
Error: mysql@5.6: no bottle available!
You can try to install from source with:
brew install --build
在Ubuntu14.04上,我在运行sudo apt-get install mysql-server时得到了这个错误
Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: linux-image-extra-3.19.0-49-generic :
Ubuntu16.04:当我使用apt安装mysql时,它显示:
The following additional packages will be installed:
apparmor mysql-server-5.7
Suggested packages:
apparmor-profiles apparmor-profiles-extra apparmor-docs apparmor-utils tinyca
The following NEW packages will be installed:
apparmor mysql-server mysql-server-5.7
我有一个group表-- option_id或extras_id应该放在单独的表中还是全部放在一个表中?以下是我的意思:
组表:
mysql> select * from `group`;
+----+-----------+--------+
| id | name | type |
+----+-----------+--------+
| 1 | Group One | extra |
| 2 | Group Two | option |
+----+-----------+--------+
有两个组(额外或选项)。
group_extra表:
mysql&g
我得到"$val“1和4的值。选中了products_extra_fields_id 1和4复选框字段,加上其他products_extra_fields_id中的另一个复选框,我有两个复选框。如何避免重复复选框字段。
<?php
$extra_fields_query = mysql_query("SELECT * FROM products_extra_fields");
while ($extra_fields = mysql_fetch_array($extra_fields_query)){
for
我想修剪MySQL数据库中所有重复的条目,根据$keep是什么,只留下最早或最新的条目。我正在使用以下代码,但速度非常慢:
function pruneDuplicates($keep) {
if($keep == 1)
$order = "ASC";
else if ($keep == 0)
$order = "DESC";
//Go through and find the duplicate hashes. Grab the IDs that correspond to them then delete all but o
这是我的empDetails表,我试图在它上创建一个存储过程。
mysql> describe empDetails;
+---------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| id | int(3) | NO | PRI | 0 | |
| name
非常奇怪的是:
mysql> explain select *from online where last < now()-interval 30 second and type=1;
+----+-------------+--------+------+---------------------------------------+------+---------+------+------+-------------+
| id | select_type | table | type | possible_keys | ke