Database operation topic 1

1. establish test database

 2. stay test Create in the database student surface

3. towards student Add records to the table  

 

 4. Use sql Statement to query all contents in the table

5. Use sql Statement to query all score>70 Of my classmates id,name,score

 

6. change name The data type of the field is varchar(50)

 

7. Add a field to the table , The field name is “pingjia”, Field type is varchar(20)

 

8. Change the score of the classmate whose name is Zhang San to 88

 

9. If 80 It's a passing line , Find out the details of all qualified students

 

10. Use keywords in, Inquire about id The value is 1 or 5 or 7 Basic information of students

11. Inquire about id Values in 5 to 8 Basic information of all students

 

12.  The query name is Xiaohong and the score is greater than 60 Basic information of students

13. The query name is Xiao Hong or the score is greater than 90 Basic information of students