What are the basic database operations?

The basic operations of the database include: 1. Basic operations of the database, creating a database, viewing all information in the database, modifying the database encoding set, and removing the database; 2. Basic operations of the table, creating tables, viewing table information, and modifying Field attributes, remove tables; 3. Basic operations of fields, add fields.

The basic operations of the database are:

1: Basic operations of the library

Prerequisite: Connect to the database

1. Add and create the database
Use the default encoding set

create database db1; # db1为数据库名

Customize the encoding set

create database db1 charset="gbk";

2. Check and view All database information
View all databases: show databases;
Detailed information: show create database db1;

3. Change, modify the database encoding set

alter database db1 charset="utf8"

4. Delete and remove the database

drop database db1;

2: Basic operations of the table

Prerequisite: Create a table under a specific database
Enter Specified database: use db1
Determine the currently used database: select database();

1. Add, create table (field 1, type,..., field n type)

create table t1(name char,age int);

2. Check and view table information
View all databases: show tables;
Detailed information: show create table t1;
Table field structure information: desc t1;

3. Change, modify field attributes

alter table t1 modify name char(20);

Modify field name

alter table t1 change name usr char(16);

Modify table name

alter table t1 rename t2;

4. Delete, remove table

drop table t1;

3: Basic operations of fields

Prerequisite: Know which table is being operated on

1. Add, add fields

insert into t1(usr,age) values ("aa",18),("bb",8);

2.Check

select * from t1;

3.Change

update t1 set age=28 where usr="aa";

4.Delete

delete from t1 where age>8;

Related learning recommendations:mysql video tutorial

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