[insert, modify and delete data in the headsong educator data table]

1、 Our mission ： stay library Database reader Insert a piece of data into the data table
full name xm For Lin tuantuan , Phone number dhhm by 13507311234, The other fields take the default value
Display all data of the data table

use library;
 # Code start 
insert into reader (xm,dhhm) values(' Lin tuantuan ',13507311234);
select * from reader;
 # Code end 

2、 Our mission ：
stay reader Insert a reader into the data table
The reader ID number is 2, The name is Chen Jie , Gender is female , Identity is teaching and research staff , The phone number is 13319551234

Tips ：reader The order of each field in the data table is dzzh,xm,xb,sf,dhhm

use library;
 # Code start 
insert into reader (dzzh,xm,xb,sf,dhhm) values(2,' Chen Jie ',' Woman ',' academic staff ',13319551234);
 # Code end 
 select * from reader;

3、 Our mission ： stay reader Insert multiple pieces of data into the data table
The name is Huang Xiaoxiao , Gender is male , Identity is graduate , The phone is 13316789987
His name is Liu Daren , Gender is male , Identity is staff , Telephone [phone]
The name is dengchaoyang , Gender is female , Identity is graduate , The phone is 17716554432
Tips ： Data sheet reader The name of 、 Gender 、 identity 、 The phone number field is xm,xb,sf,dhhm
The reader ID is a self incrementing field , Its value will be automatically generated

use library;
# Code start 
insert into reader (xm,xb,sf,dhhm) values(' Huang Xiaoxiao ',' male ',' Graduate student ',13316789987);
 insert into reader (xm,xb,sf,dhhm) values(' Liu Daren ',' male ',' Personnel ',18012341234);
 insert into reader (xm,xb,sf,dhhm) values(' Chao Yang Deng ',' Woman ',' Graduate student ',17716554432);
 # Code end 
 select * from reader;

4、 Our mission ： take reader Lin tuantuan in the data sheet xm The phone number of dhhm It is amended as follows 17718991989

 use library;
# Code start 
update reader set dhhm=17718991989 where xm=' Lin tuantuan ';
 # Code end 
 select * from reader;

5、 Our mission ： Modify the reader table reader Chen Jie xm The phone number of dhhm by 13315667745
As a staff member

 use library;
 # Code start 
 update reader set dhhm=13315667745,sf=' Personnel ' where xm=' Chen Jie ';
 # Code end 
 select * from reader;

6、 Our mission ： Put every reader reader Your reader card dzzh Number plus ten

use library;
# Code start 
update reader set dzzh=dzzh+10;
# Code end 
select * from reader;

7、 Our mission ： Delete readers reader Chen Jie in the data sheet xm

 use library;
 # Code start 
 delete from reader where xm=' Chen Jie ';
 # Code end 
select * from reader;

8、 Our mission ： Delete readers reader All graduate students in sf

 use library;
 # Code start 
 delete from reader where sf=' Graduate student ';
 # Code end 
 select * from reader;

9、 Our mission ： Delete all readers reader

 use library;
 # Code start 
 Truncate reader;
 # Code end 
 select * from reader;