mysql change field name

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Modify Table field name/Field Length/field type in mysql

In mysql, we only need to use alter to modify the data table fields. Below I will introduce how to modify the table field name, field length, and field type in mysql, for more information, see. Let's take a look at common methods. The simple Syntax

Summary: MySQL (Basic, field constraint, index, foreign key, stored procedure, transaction) operation syntax

1. Display the list of databasesshow databases; # View all current databasesShow Databases \g #以行的方式显示2. On the command line, execute the SQL statementMysql-e ' show databases '-uroot-p123456mysqlshow-uroot-p123456 # not used, just remember the one

MySQL Common instructions, java,php programmers, database engineers must. Programmers Xiaoice Common Data collation

MySQL常用指令,java,php程序员,数据库工程师必备。程序员小冰常用资料整理MySQL common commands (for reference)The most common display commands are:1. Display the list of databases;2. Display the data table in the library:Use MySQL;Show tables;3, display the

Edit table field name/Field length/fields type in MySQL

Let's take a look at the usual methods. MySQL's simple syntax, commonly used, but not easy to remember. Of course, these SQL syntaxes are basically generic in each database. Listed below: 1. Add a field ALTER TABLE user add COLUMN new1 VARCHAR

MySQL field name conflicts with reserved words and the solution, mysql Field

MySQL field name conflicts with reserved words and the solution, mysql Field Problem: Conflicts between MySQL field names and reserved words often occur in actual operations. Com. mysql. jdbc. exceptions. jdbc4.MySQLSyntaxErrorException. Solution:

MySQL change data file directory and My.ini location | MySQL command detailed

Requirements: Change the MySQL data data file directory and My.ini location.Steps:1. Find the My.ini location, and you can get the My.ini path by viewing the executable file path, which corresponds to its properties, through the MySQL startup entry

Install MySQL summary under CentOS

One, MySQL installationInstall MySQL under CentOS Please open: several important directories of MySQLMySQL installation is not as if SQL Server is installed by default in a directory,

Installing MySQL in Linux and solutions to some common problems _ MySQL-mysql tutorial

1. download MySql 1. download MySql Open download in browser My downloaded version is Red Hat 5 version of Id = 407552 Upload the file to the server, or

MySql Add Field Delete field Modify field name Modify field type

1. Add a field ALTER TABLE user add COLUMN new1 VARCHAR (x) DEFAULT NULL;    Add a field that defaults to null ALTER TABLE user add COLUMN new2 VARCHAR (a) not NULL;                Add a field, default cannot be empty//2. Delete a field ALTER TABLE

2-16 mysql field constraint-index-FOREIGN key

One: Field modifier1:null and NOT NULL modifiersLet's take a look at this example.Mysql> CREATE TABLE worker (ID int not null,name varchar (8) Not null,pass varchar (a) not null);Mysql> INSERT into worker values (1, ' HA ', ' 123456 ');Mysql> INSERT

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