Database operation topic 2

1. establish test database

2. stay test Create in the database emp surface  

3.  towards emp Add records to the table

4. Look up everything in the table  

5. The name in the query table is all the message records of Zhang San  

6. The name in the query table is the name of all employees consisting of three words ename,job,sal The corresponding information of the field

7. In the query table empno Fields from 1004 to 1008 Records of all employees  

8. Query all in the table job All the information of the employee whose field is clerk and whose name is Huang Gai  

9. Query table in 2001 Information of employees who have been employed since

 

10. The bonus in the query table （COMM） yes NULL Employee information