null not null

In mysql, null, not null, default, and auto_increment are common content. Here I will detail the usage of null, not null, default, and auto_increment in msyql. NULL and not null modifiers: You can add the NULL or not null modifier after each field

In MySQL, each field definition contains additional constraints or modifiers that can be used to increase the constraints on the input data. Today, let's take a look at MySQL field constraints:NULLAndNot

NULL and NOT NULL modifiers: You can add this null or NOT NULL modifier to each field to specify whether the field can be empty (null), or you must fill in the data (not NULL). mysql specifies null modifiers by default, and if a field is specified

Table: tabstudentinfo Id Name Gender Class Grade Primary Key NOT NULL NOT NULL NOT NULL NOT NULL Varchar (100) Varchar (100) Varchar (10) Varchar (10

1. New User: >create USER name identified by ' Ssapdrow '; 2. Change Password: >set PASSWORD for Name=password (' FDDDFD '); 3. Rights Management >show GRANTS for name; View name User Rights >grant SELECT on db_name.* to name; All permissions to

0. User management:1. New User:>create USER name identified by ' Ssapdrow ';2. Change Password:>set PASSWORD for Name=password (' FDDDFD ');3. Rights Management>show GRANTS for name; View name User Rights>grant SELECT on db_name.* to name; All

User management:1. Create a new User:>create user name identified by ' RedPen ';2. Change your password:>set Password for Name=password (' ddd ');3. Rights Management:>show grants for username; View name User Rights>grant Select on Db_name.*to name;

0. User management:1. New User:>create USER name identified by ' Ssapdrow ';2. Change Password:>set PASSWORD for Name=password (' FDDDFD ');3. Rights Management>show GRANTS for name; View name User Rights>grant SELECT on db_name.* to name; All

Reprint: http://www.cnblogs.com/picaso/archive/2012/05/17/2505895.html0. User management:1. New User:>create USER name identified by ' Ssapdrow ';2. Change Password:>set PASSWORD for Name=password (' FDDDFD ');3. Rights Management>show GRANTS for

0. User management:1. New User:>create USER name identified by ' Ssapdrow ';2. Change Password:>set PASSWORD for Name=password (' FDDDFD ');3. Rights Management>show GRANTS for name; View name User Rights>grant SELECT on db_name.* to name; All

ddl-Data Definition language (create,alter,drop,declare)dml-Data Manipulation Language (Select,delete,update,insert)dcl-Data Control Language (Grant,revoke,commit,rollback) First, a brief introduction to the underlying statement: 1, Description:

Zero. User Management: 1. Create a user: > Create user name identified by 'ssapdrow '; 2. Change the password: > Set password for name = PASSWORD ('fdddfd '); 3. permission management > Show grants for name; // view the name user permission > Grant

Sort the add, delete, modify, and query statements involved in mysql. 1. Create a user: > Create user name identified by 'ssapdrow '; 2. Change the password: > Set password for name = PASSWORD ('fdddfd '); 3. permission management > Show grants for

Database operation Mysql 1. create a user: > Create user name identified by 'ssapdrow '; 2. change the password: > Set password for name = PASSWORD ('fdddfd '); 3. permission management > Show grants for name; // view the name user permission >

0. User management:1. New User:>create USER name identified by ' Ssapdrow ';2. Change Password:>set PASSWORD for Name=password (' FDDDFD ');3. Rights Management>show GRANTS for name; View name User Rights>grant SELECT on db_name.* to name; All

The recent interview encountered a database statement, found themselves in this area almost forget the light, so immediately go to the online review.0. User management:1. New User:>create USER name identified by ' Ssapdrow ';2. Change Password:>set

0. User management:1. New User:>create USER name identified by ' Ssapdrow ';2. Change Password:>set PASSWORD for Name=password (' FDDDFD ');3. Rights Management>show GRANTS for name; View name User Rights>grant SELECT on db_name.* to name; All

User management:1. New User:>create USER name identified by ' Ssapdrow ';2. Change Password:>set PASSWORD for Name=password (' FDDDFD ');3. Rights Management>show GRANTS for name; View name User Rights>grant SELECT on db_name.* to name; All

0. User management:1. New User:>create USER name identified by ' Ssapdrow ';2. Change Password:>set PASSWORD for Name=password (' FDDDFD ');3. Rights Management>show GRANTS for name; View name User Rights>grant SELECT on db_name.* to name; All

First, user management:1. New User: >create USER name identified by ' Ssapdrow '; 2. Change Password: >set PASSWORD for Name=password (' FDDDFD '); 3. Rights Management >show GRANTS for name; View name User Rights >