# show databases;//查看所有數(shù)據(jù)庫
# 退出命令
#exit,quit,\q
#創(chuàng)建數(shù)據(jù)庫
#create database mydatabase charset utf-8;
#創(chuàng)建關(guān)鍵字?jǐn)?shù)據(jù)庫
#create database `database` charset utf-8;
#告訴服務(wù)器當(dāng)前的中文字符集是什么
#set names gbk;
#創(chuàng)建中文數(shù)據(jù)庫
#create database 中國 charset utf-8;
#創(chuàng)建數(shù)據(jù)庫
#create database informationtest charset utf-8;
#查看以information_開始的數(shù)據(jù)庫(_需要被轉(zhuǎn)義)
# show databases like `information\_%`;
# show databases like `information_%`; 相當(dāng)于information%
#查看數(shù)據(jù)庫的創(chuàng)建語句
#show create database mydatabase;
# show create database `database`;
# 修改數(shù)據(jù)庫informationtest的字符集
# alter database informationtest charset GBK;
# 刪除數(shù)據(jù)庫
# drop database informationtest;
# 創(chuàng)建表
# create table if not exists mydatabase.student(
# 顯式地將student表放到mydatabase數(shù)據(jù)庫下
# name varchar(10),
# gender varchar(10),
# number varchar(10),
# age int
# )charset utf-8;
# 創(chuàng)建數(shù)據(jù)庫
# 進(jìn)入數(shù)據(jù)庫
# use mydatabase；
# 創(chuàng)建表
# create table class(
# name varchar(10),
# room varchar(10),
# )charset utf-8;
# 查看所有表
# show tables;
# 查看以s結(jié)尾的表
# show table like `%s`;
# 查看表的創(chuàng)建語句
# show create table student;
# show create table student\g
# show create table student\G? 將查到的結(jié)構(gòu)旋轉(zhuǎn)90度變成縱向
# 查看表結(jié)構(gòu)
# desc class;
# describe class;
# show columns from class;
# 重命名表(student表 -> my_student)
# rename table student to my_student;
# 修改表選項(xiàng):字符集
# alter table my_student charset = GBK;
# 給學(xué)生表添加ID，放到第一個(gè)位置
# alter table my_student
# add column id int
# first;
# 將學(xué)生表中的number學(xué)號(hào)字段變成固定長(zhǎng)度，且放到第二位（id之后）
# alter table my_student modify number char（10） after id；
# 修改學(xué)生表中的阿gender字段為sex
# alter table my_student change genter sex varchar(10);
# 刪除學(xué)生表中的age年齡字段
# alter table my_student drop age;
# 刪除數(shù)據(jù)表
# drop table class;
# 插入數(shù)據(jù)
# insert into my_student values
# (1,'bc20190001','Jim','male'),
# (2,'bc20190002','Lily','female');
# 插入數(shù)據(jù)：指定文字列表
# insert into my_student(number,sex,name,id) values
# ('bc20190003','male','Tom',3),
# ('bc20190004','female','Lucy',4);
# 查看所有數(shù)據(jù)
# select * from my_student;
# 查看指定字段，指定條件的數(shù)據(jù)
# 查看滿足id為1的學(xué)生信息
# select id,number,sex,name from my_student where id=1;
# 更新數(shù)據(jù)
# update my_student set sex='female' where name='Jim';
# 刪除數(shù)據(jù)
# delete from my_student [where條件];
