[MySql Nanny Level Tutorial] Addition, deletion, and update of MySql data table data

1. Addition of MySql data table data
(1) Adding a single field

INSERT INTO 表名（字段名1,字段名2,...) VALUES (值 1,值 2,...);

(2) Add multiple fields

INSERT INTO 表名 [(字段名1,字段名2,...)]VALUES (值 1,值 2,…),(值 1,值 2,…),...;

For example

insert into stu(id,name,cj) values(2020214541,'sds',78);

2. Deletion of MySql data table data
Delete some tables

DELETE FROM 表名 [WHERE 条件表达式];

delete table

DELETE FROM 表名 ；

For example

delete from student where age=14；

delete from student;

3. MySql data table data search

select * from student;//查询所有表
select sid,sname from student;//查询部分表
select sid,sname,'2021-03-02' from student;//查询常量
select distinct gender from student;//查询并去除重复
select sname,age+10 from student;//查询带有逻辑运算

4. Update the MySql data table data

UPDATE 表名 SET 字段名1=值1[,字段名2 =值2,…] [WHERE 条件表达式];

Update some data

update student set age=20,gender='female' where name='tom';

update all data

update student set age=18;