1. SQLPLUS: Oracle SQL Interface

2. Oracle SQL*Plus Interactive user environment Documentation
Can run SQL statements
PL/SQL statements
Other SQL*plus commands
Allows simple command editing
Documentation
Help command in sqlplus

3. Change Password SQL> alter user username identified by newpassword;
Username is oracle username
Newpassword is the password you want
; is necessary to terminate SQL statement

4. SQL*Plus SQL*plus understands only Oracle SQL
An SQL statement must end
a semicolon ;
a / on a line by itself
blank line
SQL statement can be typed in or loaded from a file
get filename
An SQL statement can be executed from the command buffer (run) or from an sql file
SQL statement in buffer can be written to a file
save filename

5. Common SQL*Plus Commands
Display schema
describe table_name
Run Unix commands
!command
Run editor on .sql file
edit filename
Customize environment
echo on
pause on
pagesize 30
Show command in buffer
list

6. Company Database
Employee, department, dept_locations, dependent, works_on and project tables
User sys.tablename to refer to tables
Example: retrieve all employee information
Select *
from sys.employee
Use the following to find details of tables
SQL> describe sys.employee;

7. Company Queries Q1: Find the number of employees
SQL> select count(*)
2 from sys.employee;
COUNT(*) 40

8. Company Queries Q2: Find the highest salary SQL> select max(salary)
2 from sys.employee;
MAX(SALARY)
96000

9. Company Queries Q3: Find the number of departments
SQL> select distinct dno
2 from sys.employee;
DNO 1 6 5 4 8 7
6 rows selected.

10. Company Queries Q4: Find the name of employee with the highest salary
SQL> select fname, minit, lname
2 from sys.employee
3 where salary = (select max(salary)
from sys.employee);
FNAME M LNAME
Bob B Bender

11. Company Queries
Q5: Find the number of employees working in each department.
SQL> select dno, count(*)
2 from sys.employee
3 group by dno;
DNO COUNT(*)
6 rows selected.

12. Company Queries Q6: Find the number of female employees
select count(*)
from sys.employee
where sex = ‘F';

13. Company Queries Q7: Find the maximum salary of female employees
select max(salary)
from sys.employee
where sex = ‘F’;

14. Company Queries
Q8: Find the maximum salary of male and female employees
select sex, max(salary)
from sys.employee
group by sex;

15. Company Queries
Q9: Find the first name, last name of employees who work for department 5
select fname,lname
from sys.employee
where dno=5;

16. Company Queries
Q10: Find the first name, last name of employees who work for research department
select fname,lname
from sys.employee, sys.department
where dno = dnumber and dname = 'Research';

17. Company Queries
Q11: Find the number of employees who work for research department
select count(*)
from sys.employee, sys.department
where dno = dnumber and dname = 'Research';

18. Company Queries
Q12: Find the number of employees who do not work for research department
select count(*)
from sys.employee, sys.department
where dno = dnumber and dname != 'Research';

19. Company Queries
Q13: Find the total salary of employees who work for research department
select sum(salary)
from sys.employee, sys.department
where dno = dnumber and dname = 'Research';

20. Company Queries
Q14: Find the department name and total salary of employees for each department
select dname, sum(salary)
from sys.employee, sys.department
where dno = dnumber
group by dname;

21. Company Queries
Q15: Find the names of departments that have more than 3 employees
select dname
from sys.employee, sys.department
where dno = dnumber
group by dname
having count(*) >3;

22. Company Queries
Q16: Find the names of employees who do not have supervisors
select fname, lname
from sys.employee
where superssn IS NULL;

23. Company Queries
Q17: Find the names of employees who have no dependents
select fname, lname
from sys.employee
where not exists (select *
from sys.dependent
where ssn=essn);

24. Company Queries
Q18: Count the number of distinct salary values in the database
select count (distinct salary)
from sys.employee;