mysql | 易学教程

How to make sql join query in laravel 5?

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问题 Hi I want to get data from database, I am using join query but I have got this error: QueryException in Connection.php line 673: SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'surat_masuk' (SQL: select jenis_surat . jenis_surat , surat_masuk . nomor_surat , surat_masuk . perihal , surat_masuk . tanggal_publish from surat_masuk inner join jenis_surat on id_jenis_surat = jenis_surat . id_jenis_surat inner join surat_masuk on id_jenis_surat = surat_masuk . id

How to make sql join query in laravel 5?

阅读更多关于 How to make sql join query in laravel 5?

How to make sql join query in laravel 5?

阅读更多关于 How to make sql join query in laravel 5?

How to make sql join query in laravel 5?

阅读更多关于 How to make sql join query in laravel 5?

How to make sql join query in laravel 5?

阅读更多关于 How to make sql join query in laravel 5?

Passing multiple values as parameter to mysql query

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问题 I have a database, and I want to get the names of multiple users in the same query by passing in an array of user_ids. Sadly, I cannot get this to work. I have this query: $stmt = $this->db->prepare('SELECT name FROM users WHERE user_id=?'); Where the parameter is an array: $stmt->bind_param('i', $user_ids); The user_ids array looks like this {1, 2} . Basically, I want to get the name of user 1 and user 2, without having to query the database more than one time. When I have this code, I only

腾讯云服务器部署web项目

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一、首先需要去腾讯云购买一个云服务器，个人可以免费领取一个十五天的体验版. https://cloud.tencent.com/act/free 二、在自己电脑点击开始菜单-> Run，输入"mstsc"命令，即可打开远程桌面连接对话框。在输入框中输入腾讯云服务器的公网IP，在云服务器云主机可以查看公网IP 点击链接后，输入管理员账号和密码（账号和密码可以在消息中心的站内信查看）登录后就可以链接到云服务器的桌面三、在云服务器中，需要进行下载安装Tomcat，MySQL和JDK，过程中有问题可自行百度. 关于此处有个人发现的一些小技巧，在文章末尾有总结. 四、环境配置完毕后，将eclipse的项目导出成war文件，然后放到Tomcat的webapps文件夹下. 然后可以将数据库导入. 五、启动Tomcat，打开浏览器输入http://localhost:8080……..后面的大家都懂，和在自己电脑上查看发布在Tomcat的项目相同，如果可以显示，说明环境配置成功. 六、在自己电脑云主机-控制台页面，点击安全组，添加一个安全组. 注意！！！！新建的安全组要选择放通全部端口，创建好后，点击最右边管理实例，将你的云主机添加进来，进行关联. 七、当我做到这里就在自己电脑用外网IP尝试登陆，发现并不可以.最后还有关键的一步. 转载自他人并盗图 https://www

docker快速部署mysql

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[toc] docker快速部署mysql 拉取mysql镜像 docker pull mysql:8.0 docker pull mysql:5.7 针对上面不同版本，只需要将对应的版本调整下即可第一种 mysql docker run -di --restart=always --name=mysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql:8.0 第二种 mysql docker run -di --restart=always -p 3306:3306 --name mysql \ -v /usr/local/docker/mysql/conf:/etc/mysql \ -v /usr/local/docker/mysql/logs:/var/log/mysql \ -v /usr/local/docker/mysql/data:/var/lib/mysql \ -v /usr/local/docker/mysql/mysql-files:/var/lib/mysql-files \ -e MYSQL_ROOT_PASSWORD=123456 \ -d mysql:8.0 mysql安装之后 docker ps -a 查找到容器id docker exec -it id /bin/bash 进入mysql容器

1 very large table or 3 large table? MySQL Performance

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问题 Assume a very large database. A table with 900 million records. Method A: Table: Posts +----------+-------------- +------------------+----------------+ | id (int) | item_id (int) | post_type (ENUM) | Content (TEXT) | +----------+---------------+------------------+----------------+ | 1 | 1 | user | some text ... | +----------+---------------+------------------+----------------+ | 2 | 1 | page | some text ... | +----------+---------------+------------------+----------------+ | 3 | 1 | group |

Mysql - dynamic SQL not allowed in trigger

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问题 I want to create a trigger with dynamic SQL where I get a column name from a variable. Here is my simplified mysql schema: CREATE TABLE products (id int); INSERT INTO products VALUES (1),(2); CREATE TABLE attribute_values (product_id int, `key` varchar(100), value varchar(100)); INSERT INTO attribute_values VALUES ( 1, 'title', 'Orange'), ( 1, 'code', 'O125'), ( 2, 'title', 'Pizza'); CREATE TABLE product_attributes SELECT products.id, MAX(CASE WHEN attribute_values.key = 'title' THEN