MySQL command (add, delete, check and modify)

Preface ： installed Mysql After configuration, the environment can run normally ; download Navicat Premium Installation can be operated .

One 、： Inquire about

1. Check everything select * from user where 1（ Red characters are general characters ）
2. Querying a user
select * from user where name=‘zeng8’ and password=’zmm123‘
3. The score is greater than 500
select * from user where score>500
4.name zeng_ Of
_ Represents any character （10 I can't get out ,8 and 9 Can come out ）
% Represents one or more characters
select * from user where name like ‘zeng_’
select * from user where name like ‘zeng%

5. Query all users , from 1 Start , Intercept 2 strip
select * from user where 1 limit1,2

6. Query all users , Sort by score , Ascending acs , Descending desc
select * from user where 1 order by score asc
select * from user where 1 order by score desc

7. Query two fields
select name ,scorefrom user where 1

Two 、 Insert

1. word :

insert Insert
into To
user indicate
values value

2.insert   into  user（name,password,score）
values（‘zeng11’,‘zmm123’,120）

3. hold zeng8 Change your score to 2500
update user set score =2500 where name ='zeng8'
hold zeng_ Score change 2500 _ Arbitrary character
update user set score =2500 where name like 'zeng_'

3、 ... and 、 Delete

1.DELETE form user where id=5
Delete user in id by 5 The line of