mysql black window ~ build database and build table

//Create a database
create database tablename;

For example create database drop_testdb;

//Show all data

show databases;

As follows:

// drop database
drop database ;

// View data in table
select * from `test`;

// Display the selected field content
SELECT `id`, `name` FROM `test` WHERE 1

// create a database
create database drop_database;

// Use the database
use drop_database;

// Show all tables in the database
show tables;

// if exists determine whether the database exists, no error will be generated
drop database if exists drop_database;

Create data table
create table user(
id int primary key auto_increment,
username varchar(20) not null default ' ',
passwd char(32) not null default ' ',
email varchar(50) not null default ' ',
gender char(1) not null default ' ',
age tinyint unsigned not null default 0
)enginemyisam charset utf8

// drop table
drop table table_name;

//Add data to the test table
INSERT INTO `test`(`id`, `name`) VALUES ('1','Li Si');

// View data in table
select * from `test`;

// Modify the data in the table
UPDATE `test` SET `id`='This is the modified id', `name`='This is the modified content'WHERE `id`=1;

// delete data from table
DELETE FROM `test` WHERE 1

//Add a field to a table
alter table user add email varchar(50) not null default ' ' after passwd;

// Set display character set
set names gbk;