MySQL common commands

mysql -u user name  -p password  # Connect to database 
show databases; # Display database 
use  Database name ; # Access to database 
show tables; # Display all tables in the current library 
create table  The new name of the table  from select * from  The old name of the table ; # Backup tables 
create database  Library name ; # Create database 
drop database  Database name ; # Delete database 
creat table < Table name >（< Field name 1>< type 1>[...< Field name n>< type n>]）; # Create table 
drop table  Table name ; # Delete table 
DELETE FROM  Table name ; # Clear the table 
TRUNCATE  Table name ; # Truncation table 
update  Data table name  set  Field = The new value ,...where  Conditions ; # Modify table data 
delect from  Data table name  where  expression ; # Delete table data 
alter table  Data table name  add  Field   type ; # Add fields 
rename table  Original table name  to  The new name of the table ; # Modify the name of the table 
insert into  Table name  values ( Field list ); # Insert table data 
mysqldump --opt test > mysql.test # About database test Export database to mysql.test text file 
show status like 'thread%'; # see mysql Current connections 
show variables like '%connections%'; # see mysql What's the maximum number of connections 

Execute in batch on the command line .sql file

source .sql file ; # This is to execute a .sql Files can use commands , When there are many .sql We can choose to create a new file .sql file 
# for example : We have 1.sql,2.sql.3.sql,4.sql,5.sql,6.sql,7.sql,8.sql,9.sql,10.sql, Here are ten sql The file needs to be executed , It needs to be executed ten times source command 
 At this time, we can create a new .sql file ,exp.sql, Here is exp.sql The content of the document 
source 1.sql;
source 2.sql;
source 3.sql;
source 4.sql;
source 5.sql;
source 6.sql;
source 7.sql;
source 8.sql;
source 9.sql;
source 10.sql;
# Then we can execute once source exp.sql Just order .