how to insert column in mysql

MySQL 5.7 new feature: Generated Column (function index) MySQL 5.7 introduces Generated Column. This article briefly introduces the usage and precautions of Generated Column, and provides a quick and complete tutorial for readers to understand MySQL

Insert a new column after specifying a column in MySQL, and insert a column in mysql.ALTER [ONLINE | OFFLINE] [IGNORE] TABLE tbl_nameAlter_specification [, alter_specification]...Alter_specification:Table_options| ADD [COLUMN] col_name

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.show databases;2. Display the data table in the library:Use MySQL;Show tables;3, display the

Usage of INSERT, UPDATE, DELETE, and REPLACE statements in MySQL database bitsCN.com MySQL database insert and update statementsThe SQL statements used to operate databases are generally divided into two types: Query statements, SELECT statements,

This article is a MySQL database insert, UPDATE, delete and replace statements in the use of detailed analysis of the introduction, the need for friends to refer to the MySQL database insert and UPDATE statements Introduction: The SQL used to

1 description (1) for the MyISAM table, if the auto-increment column is updated using UPDATE, if the column 20540 is repeated with the existing 20540, an error will occur. if the column is greater than the existing maximum 20540 ;, the

This article is a detailed analysis of the use of the MySQL database insert, UPDATE, delete, and replace statements, the need for a friend referenceMySQL database insert and UPDATE statementsCitation: SQL used to manipulate the database is generally

Precautions for using the AUTO_INCREMENT column in MySQL: update auto-incrementing Column1. Description (1) For the MyISAM table, if you use UPDATE to UPDATE the auto-incrementing column, if the column value is the same as the existing value, an

MySQL database insert and update statementsThe SQL statements used to operate databases are generally divided into two types: Query statements, SELECT statements, and update statements, which are also called data operation statements. The

The following article describes the update statements of the MySQL database in detail. We will introduce the INSERT and REPLACE statements to you today, we all know that the syntax of these two statements is very similar. The main difference between