Connect to Database Connects to MySQL, open a tab for DB Notebook, and execute the \about command. This action closes a currently active connection tab. Connect to Database on New Tab Connects to MySQL and o
Slow query in a view, how to improve it (similar to putting indexes?) Posted by:Cyril N. Date: August 28, 2023 06:33AM Hi everyone! I made quite a complex View on my MySQL database, and I realized that some queries are slow. My first idea was to add indexes but it's not ...
pojie方式:https://www.jb51.net/database/710931.html 用户4919348 2022/04/13 1.6K0 MySQL之视图 数据库sql 一张虚表,和真实的表一样。视图包含一系列带有名称的行和列数据。视图是从一个或多个表中导出来的,我们可以通过insert,update,delete来操作视图。当通过视图看到的数据被修改时,相应的原表的数据也会...
showdatabases;-- 查看所有数据库showtables;-- 查看当前库的所有表showTABLESFROM-- 查看某个指定库下的表showcreatedatabase world-- 查看建库语句showcreatetableworld.city-- 查看建表语句showgrantsforroot@'localhost'-- 查看用户的权限信息showcharset;-- 查看字符集showcollation-- 查看校对规则showprocesslist;-...
Data.MySqlClient; // 创建连接字符串 string connectionString = "server=localhost;database=mydatabase;uid=username;password=password"; // 创建MySQL连接对象 using (MySqlConnection connection = new MySqlConnection(connectionString)) { // 打开数据库连接 connection.Open(); // 创建SQL查询语句 string ...
MySQL & view MySql 视图 mysql 视图 https://www.cnblogs.com/chenpi/p/5133648.html MySql 视图修改 MySql视图view的使用:创建、修改、删除 - IT笔录 https://itbilu.com/database/mysql/E1q5C22_.html#update 注:用 AS 来重命名原始列名 https://blog.csdn.net/pythonkiddz/article/details/55059162 ...
OK, 0 rows affected (0.01 sec) mysql> SHOW CREATE VIEW test.v\G *** 1. row ***View: v Create View: CREATE VIEW "v AS select concat('a','b') AS "col1" ... 1 row in set (0.00 sec) ビュー定義を正規の形式で格納する利点は、後 sql_mode の値を変更しもビューの結果...
Database changed mysql> SELECT * FROM triggers WHERE trigger_name='trigger_student_count_insert'; 1. 2. 3. 4. 删除触发器 DROP TRIGGER trigger_name; 1. 五、MySQL用户和权限管理 1、元数据数据库:mysql 系统授权表: db, host, user
GRANTSHOWVIEWONdatabase_name.*TO'username'@'host'; 1. 其中,database_name是数据库名称,username是用户名称,host是主机名或IP地址。通过这条语句,可以将username用户对database_name数据库下所有表的查看权限授予给该用户。 Grant View权限的示例 下面通过一个示例来演示如何使用Grant View权限: ...
I have 2 databases, and I want to create a view on database 1 which looks at a table which is in database 2. The table is a users table, I don't want to have to replilcate the database over 2 databases continuosly. If anyone has a solution it would be greatly appreciated....