View database
show databases;
Create a database of students
create database student；
Create student table
create table student
(
id int auto_increment,
name varchar(30) not null,
primary key(id)
);
limit
select * from student limit 1; #Output a piece of information in the student table
offset
select * from student limit 1 offset 1; #Start from the second data to output a piece of information in the student table
select * from student limit 1 offset 2; #Start from the third data to output a piece of information in the student table
select * from student limit 2 offset 1; #Output 2 pieces of learning information from the second piece of data
select * from student limit 2 offset 2; #Start from the third piece of data to output 2 pieces of student information