Common MySQL commands under Ubuntu

xindoo 2021-01-21 18:37:43
common mysql commands ubuntu

One 、mysql Service operation

0、 Check the database version sql-> status; 1、net start mysql // start-up mysql service 2、net stop mysql // stop it mysql service 3、mysql -h The host address -u user name -p User password // Get into mysql database 4、quit // sign out mysql operation 5、mysqladmin -u user name -p Old password password New password // Change password 6、grant select on database .* to user name @ Log on to the host identified by " password " // Add new users exemple: example 2、 Add a user test2 The password for abc, Let him only be in localhost On the login , And it can be used for database mydb The query 、 Insert 、 modify 、 Deleted actions (localhost Refers to the local host , namely MYSQL The host where the database is located ), In this way, the user can use it to know test2 Password , He can't go from internet Direct access to data on library , Only through MYSQL Host computer web Page came to visit . grant select,insert,update,delete on mydb.* to test2@localhost identified by "abc"; If you don't want to test2 Password , You can type another command to erase the password . grant select,insert,update,delete on mydb.* to test2@localhost identified by "";

Two 、 Database operation

1、show databases; // List databases 2、use database_name // Use database_name database 3、create database data_name // Create a data_name The database of 4、drop database data_name // Delete one named data_name The database of

3、 ... and 、 Table operations

1、show databases;// List all databases use Database name ; // To a database show tables // List all the tables create table tab_name( id int(10) not null auto_increment primary key, name varchar(40), pwd varchar(40) ) charset=gb2312; Create a file called tab_name New table of 2、drop table tab_name Delete the name tab_name Data sheet for 3、describe tab_name // The display name is tab_name The data structure of the table 4、show columns from tab_name // ditto 5、delete from tab_name // Will table tab_name The records in are cleared 6、select * from tab_name // Display table tab_name Records in 7、mysqldump -uUSER -pPASSWORD --no-data DATABASE TABLE > table.sql // Replicated table structure

Four 、 Modify table structure

1、 ALTER TABLE tab_name ADD PRIMARY KEY (col_name) explain : Change the definition of the table to set a field as the primary key . 2、ALTER TABLE tab_name DROP PRIMARY KEY (col_name) explain : Delete the definition of primary key 3、 alter table tab_name add col_name varchar(20); // stay tab_name Add a new one named col_name And the type is varchar(20) 4、alter table tab_name drop col_name // stay tab_name Lieutenant general col_name Field to delete 5、alter table tab_name modify col_name varchar(40) not null // Modify field properties , Note if added not null There is no data under the original field SQL Server200 It's written as :Alter Table table_name Alter Column col_name varchar(30) not null; 6、 How to modify the table name :alter table tab_name rename to new_tab_name 7、 How to modify the field name :alter table tab_name change old_col new_col varchar(40); // Properties such as data type must be specified for the current field , Otherwise, it cannot be modified 8、create table new_tab_name like old_tab_name // Create a new table with an existing table , But it doesn't contain data from the old table

5、 ... and 、 Data backup and recovery

Import external data text : 1. Execute external sql Script Execute... On the current database :mysql < input.sql Specify the database to execute :mysql [ Table name ] < input.sql 2. Data in command load data local infile "[ file name ]" into table [ Table name ]; Backup database :(dos Next ) mysqldump --opt school>school.bbb mysqldump -u [user] -p [password] databasename > filename ( Backup ) mysql -u [user] -p [password] databasename < filename ( recovery )

6、 ... and 、 uninstall

uninstall mysql:sudo apt-get remove mysql-server mysql-client sudo apt-get autoremove

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