The use of MySQL database in Linux②-----Basic operation of data

One, insert data

insert into 表名(字段1,字段2, ...) values(数据1, 数据2, ...);

Two, delete data

delete is used to delete data rows, and must be judged with where.

#将student表中id=2的数据行删除
delete from student where id = 2;

Three, modify the data

The update statement is used to modify the data, usually with where or having to make conditional judgments.

#将student表中id=1的name字段的数据修改为chenih
update student set name='chenih' where id=1;

Four, view the data

The select statement is used to query data, and it usually cooperates with where or having to make conditional judgments.

select * from 表名;
select 字段1, 字段2, ..., 字段n from 表名;
select * from 表名 where 字段名='数据值';
select * from 表名 having 字段名='数据值';

Five, copy the form

1. Copy the data of
the table The attributes of the fields in the original table will not be copied.

#将新表名中的数据复制到新表名中
create table 新表名 select * from 原表名 ;

2. Copy the structure and attributes of the
table The data in the original table will not be copied.

create table 新表名 like 原表名 ;