1。在安装Mysql*.rpm 包时提试错误error: Failed dependencies:perl(CGI) is needed by MySQL-client-4.0.26-0perl(DBI) is need
1。在安装Mysql*.rpm 包时提试错误
error: Failed dependencies:
perl(CGI) is needed by MySQL-client-4.0.26-0
perl(DBI) is needed by MySQL-client-4.0.26-0
error: Failed dependencies:
perl(DBI) is needed by MySQL-server-4.0.26-0
主要是因为缺少mysql组件造成的,在安装linux时,如何安装了相映的
组件就不会发生这种情况~可以,在光盘中找到以下rpm 包,安装就可以
解决,也可以在增加/删除程序中,,安装myql服务中安装。
perl DB_File-1.804-88
postgresql-libs-7.3.2-3
postgresql-7.3.2-3
postgresql-server-7.3.2-3
perl-CGI-2.81-88.i386.rpm
测试,解决
2。mysql之后出现的问题如下:启动
[root@localhost bin]# ./mysql
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket
’/tmp/mysql.sock’ (2)
解决方法:
#chown -R mysql:mysql /var/lib/mysql
[root@localhost beinan]# /etc/init.d/mysqld start
启动 MySQL: [ 确定 ] 成功解决
3.解决mysql“Access denied for user ’root’@’localhost’”
错误1
Enter password:
ERROR 1045 (28000): Access denied for user ’root’@’localhost’ (using password:
YES)
错误2
# mysql -uroot -p
Enter password:
ERROR 1045 (28000): Access denied for user ’root’@’localhost’ (using password:
NO)
解决方法:
方法一:
# /etc/init.d/mysql stop
# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
# mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD(’newpassword’) where USER=’root’;
mysql> FLUSH PRIVILEGES;
mysql> quit
# /etc/init.d/mysql restart
# mysql -uroot -p
Enter password: 测验成功
mysql>
解决方法二:
直接使用/etc/mysql/debian.cnf文件中[client]节提供的用户名和密码:
# mysql -udebian-sys-maint -p
Enter password:
mysql> UPDATE user SET Password=PASSWORD(’newpassword’) where USER=’root’;
mysql> FLUSH PRIVILEGES;
mysql> quit
# mysql -uroot -p
Enter password:
mysql>
解决方法三:(没有测试)
# mysql -uroot -p
Enter password:

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MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.

MySQL is suitable for beginners because: 1) easy to install and configure, 2) rich learning resources, 3) intuitive SQL syntax, 4) powerful tool support. Nevertheless, beginners need to overcome challenges such as database design, query optimization, security management, and data backup.

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MySQL is not only a database management system (DBMS) but also closely related to programming languages. 1) As a DBMS, MySQL is used to store, organize and retrieve data, and optimizing indexes can improve query performance. 2) Combining SQL with programming languages, embedded in Python, using ORM tools such as SQLAlchemy can simplify operations. 3) Performance optimization includes indexing, querying, caching, library and table division and transaction management.

MySQL uses SQL commands to manage data. 1. Basic commands include SELECT, INSERT, UPDATE and DELETE. 2. Advanced usage involves JOIN, subquery and aggregate functions. 3. Common errors include syntax, logic and performance issues. 4. Optimization tips include using indexes, avoiding SELECT* and using LIMIT.


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