select: extract data from the database
update: update the data in the database
detele: delete data from the database
insert into: insert new data into the database
create table: Create a new table
create index: delete index
create database: Create a new database
alter table: change the database table
alter database: modify the database
drop table: drop table
drop index: delete the index
if not exists: No error message
mysql -uroot -p123456: link mysql database server
show databases: View database instance in
use: the use of the database instance
show tables: table View database instance
+ Mysql database server connection
```bash
mysql -uroot -p123456
```
+ Mysql database instance View database
```sql
show databases;
```
+ Create a database instance (music)
```sql
create database music;
```
+ Database instance (Music)
```sql
use music;
```
+ See all current tables in the database instance
```sql
show tables;
```
+ All the records in the query the user table
```sql
select * from tbuser;
```
+ Add Data (single data) to a user table,
```sql
insert into tbuser() values('');
```
+ Added data (a plurality of data) to a user table,
```sql
insert into tbuser() values(),();
```
+ Modify data
```sql
update tbuser set password='000000' where username='。。;
```
+ Delete Data (delete the record id 3)
```sql
delete from tbuser where id=3;
```
+ Query for all user information is disabled
```sql
select * from tbuser where status=0;
```
+ Delete files larger than 20
delete from tbmusic where id>20;
As a beginner, writing is not very complete, will make up relatively behind.