mysql建表常用sql语句个人经验分享_MySQL
mysql建表常用sql语句个人经验分享_MySQL
连接:mysql -h主机地址 -u用户名 -p用户密码 (注:u与root可以不用加空格,其它也一样)
断开:exit (回车)
创建授权:grant select on 数据库.* to 用户名@登录主机 identified by /"密码/"
修改密码:mysqladmin -u用户名 -p旧密码 password 新密码
删除授权: revoke select,insert,update,delete om *.* from test2@localhost;
显示数据库:show databases;
显示数据表:show tables;
显示表结构:describe 表名;
创建库:create database 库名;
删除库:drop database 库名;
使用库(选中库):use 库名;
创建表:create table 表名 (字段设定列表);
删除表:drop table 表名;
修改表:alter table t1 rename t2
查询表:select * from 表名;
清空表:delete from 表名;
备份表: mysqlbinmysqldump -h(ip) -uroot -p(password) databasename tablename > tablename.sql
恢复表: mysqlbinmysql -h(ip) -uroot -p(password) databasename tablename < tablename.sql(操作前先把原来表删除)
增加列:ALTER TABLE t2 ADD c INT UNSIGNED NOT NULL AUTO_INCREMENT,ADD INDEX (c);
修改列:ALTER TABLE t2 MODIFY a TINYINT NOT NULL, CHANGE b c CHAR(20);
删除列:ALTER TABLE t2 DROP COLUMN c;
备份数据库:mysql/bin/mysqldump -h(ip) -uroot -p(password) databasename > database.sql
恢复数据库:mysql/bin/mysql -h(ip) -uroot -p(password) databasename < database.sql
复制数据库:mysql/bin/mysqldump --all-databases > all-databases.sql
修复数据库:mysqlcheck -A -o -uroot -p54safer
文本数据导入: load data local infile /"文件名/" into table 表名;
数据导入导出:mysql/bin/mysqlimport database tables.txtbitsCN.com
以上就是mysql建表常用sql语句个人经验分享_MySQL的内容,更多相关内容请关注PHP中文网(www.php.cn)!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

SQL statements can be created and executed based on runtime input by using Oracle's dynamic SQL. The steps include: preparing an empty string variable to store dynamically generated SQL statements. Use the EXECUTE IMMEDIATE or PREPARE statement to compile and execute dynamic SQL statements. Use bind variable to pass user input or other dynamic values to dynamic SQL. Use EXECUTE IMMEDIATE or EXECUTE to execute dynamic SQL statements.

Apache connects to a database requires the following steps: Install the database driver. Configure the web.xml file to create a connection pool. Create a JDBC data source and specify the connection settings. Use the JDBC API to access the database from Java code, including getting connections, creating statements, binding parameters, executing queries or updates, and processing results.

How to solve the MySQL "Access denied for user" error: 1. Check the user's permission to connect to the database; 2. Reset the password; 3. Allow remote connections; 4. Refresh permissions; 5. Check the database server configuration (bind-address, skip-grant-tables); 6. Check the firewall rules; 7. Restart the MySQL service. Tip: Make changes after backing up the database.

To improve the performance of PostgreSQL database in Debian systems, it is necessary to comprehensively consider hardware, configuration, indexing, query and other aspects. The following strategies can effectively optimize database performance: 1. Hardware resource optimization memory expansion: Adequate memory is crucial to cache data and indexes. High-speed storage: Using SSD SSD drives can significantly improve I/O performance. Multi-core processor: Make full use of multi-core processors to implement parallel query processing. 2. Database parameter tuning shared_buffers: According to the system memory size setting, it is recommended to set it to 25%-40% of system memory. work_mem: Controls the memory of sorting and hashing operations, usually set to 64MB to 256M

Steps to automatically back up MySQL data using Navicat: Install and connect to the MySQL server. Create a backup task, specifying the backup source, file location, and name. Configure backup options, including backup type, frequency, and retention time. Set up an automatic backup plan, enable automatic backup, set time and frequency. Preview the backup settings and perform the backup. Monitor backup progress and history.
