1. EXAMPLE Emp table: SS# Name Age Salary dno 1 Joe 24 20000 2 Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
2019/2/22

2. EXAMPLE Select * From Emp Where salary=30,000 Emp table: SS# Name Age
dno 1
Joe 24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
Select *
From Emp
Where salary=30,000
2019/2/22

3. EXAMPLE Select * From Emp Where salary=30,000 Emp table: SS# Name Age
dno 1
Joe 24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
Select *
From Emp
Where salary=30,000
SS#
Name
Age
Salary
dno 4
Kathy 30
30000 5
2019/2/22

4. EXAMPLE Select * From Emp Where age > 22 Emp table: SS# Name Age
Salary
dno 1
Joe 24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
Select *
From Emp
Where age > 22
2019/2/22

5. EXAMPLE Select * From Emp Where age > 22 Emp table: SS# Name Age
Salary
dno 1
Joe 24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
Select *
From Emp
Where age > 22
SS#
Name
Age
Salary
dno 1
Joe 24
20000 2 4
Kathy 30
30000 5
2019/2/22

6. EXAMPLE Emp table: SS# Name Age Salary dno 1 Joe 24 20000 2 Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
2019/2/22

7. EXAMPLE Emp table: Select age From Emp SS# Name Age Salary dno 1 Joe24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
Select age
From Emp
Age 24 20 22 30 4
2019/2/22

8. EXAMPLE Emp table: Select name, age From Emp Where Salary = 4000 SS#
dno 1
Joe 24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
Select name, age
From Emp
Where Salary = 4000
2019/2/22

9. EXAMPLE Emp table: Select name, age From Emp Where Salary = 4000 SS#
dno 1
Joe 24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
Select name, age
From Emp
Where Salary = 4000
SS#
Name
Age
Salary
dno 5
Shideh 4
4000 1
2019/2/22

10. EXAMPLE Emp table: Select name, age From Emp Where Salary = 4000 SS#
dno 1
Joe 24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Emp table:
Select name, age
From Emp
Where Salary = 4000
Name
Age
Shideh 4
2019/2/22

11. Join clause Example: Emp table: Dept table: SS# Name age salary dno
345
John Doe 23
25,000 1
943
Jane Java 25
28,000 2
876
Joe SQL 22
32,000
dno
dname
floor
mgrSS# 1
Toy
345 2
Shoe
943
2019/2/22

12. Join clause
Select *
From Emp e, Dept d
Where e.dno = d.dno
2019/2/22

13. Join clause Select * From Emp e, Dept d Where e.dno = d.dno SS# Name
age
salary
e.dno
d.dno
dname
floor
mgrSS#
345
John Doe 23
25,000 1
Toy
876
Joe SQL 22
32,000
943
Jane Java 25
28,000 2
Shoe
2019/2/22

14. EXAMPLE JOIN Select * From Emp e, Dept d Where e.dno = d.dno EMP Dept
SS#
Name
Age
Salary
dno 1
Joe 24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Select *
From Emp e, Dept d
Where e.dno = d.dno
dno
dname
floor
mgrss# 1
Toy 5 2
Shoe
EMP
Dept
2019/2/22

15. EXAMPLE JOIN Select * From Emp e, Dept d Where e.dno = d.dno EMP Dept
SS#
Name
Age
Salary
dno 1
Joe 24
20000 2
Mary 20
25000 3
Bob 22
27000 4
Kathy 30
30000 5
Shideh
4000
Select *
From Emp e, Dept d
Where e.dno = d.dno
dno
dname
floor
mgrss# 1
Toy 5 2
Shoe
EMP
Dept
SS#
Name
Age
Salary
e.dno
d.dno
dname
floor
mgrss# 1
Joe 24
20000 2
Shoe
Mary 20
25000
Toy 5 3
Bob 22
27000 4
Kathy 30
30000
Shideh
4000
2019/2/22

16. EXAMPLE SS# Name Age Salary mgrSS# 1 Joe 30 30000 Null 2 Bob 23 25000
Shideh 4
40000
Kathy 15
32000
2019/2/22

17. EXAMPLE SS# Name Age Salary mgrSS# 1 Joe 30 30000 Null 2 Bob 23 25000
Shideh 4
40000
Kathy 15
32000
Select e.name
From Emp e, Emp Mgr
Where e.mgrSS# = Mgr.SS# and e.salary > Mgr.salary
2019/2/22

18. EXAMPLE EXECUTION SS# Name Age Salary mgrSS# 1 Joe 30 30000 Null 2 Bob23
25000 3
Shideh 4
40000
Kathy 15
32000
Select e.name
From Emp e, Emp Mgr
Where e.mgrSS# = Mgr.SS# and e.salary > Mgr.salary
e.SS#
e.Name
e.Age
e.Salary
e.mgrSS#
Mgr.SS#
Mgr.Name
Mgr.Age
Mgr.Salary
Mgr.mgrSS# 2
Bob 23
25000 1
Joe 30
30000
Null 3
Shideh 4
40000
Kathy 15
32000
2019/2/22

19. EXAMPLE SS# Name Age Salary mgrSS# 1 Joe 30 30000 Null 2 Bob 23 25000
Shideh 4
40000
Kathy 15
32000
Select e.name
From Emp e, Emp Mgr
Where e.mgrSS# = Mgr.SS# and e.salary > Mgr.salary
e.SS#
e.Name
e.Age
e.Salary
e.mgrSS#
Mgr.SS#
Mgr.Name
Mgr.Age
Mgr.Salary
Mgr.mgrSS# 3
Shideh 4
40000 1
Joe 30
30000
Null
Kathy 15
32000
2019/2/22

20. EXAMPLE SS# Name Age Salary mgrSS# 1 Joe 30 30000 Null 2 Bob 23 25000
Shideh 4
40000
Kathy 15
32000
Select e.name
From Emp e, Emp Mgr
Where e.mgrSS# = Mgr.SS# and e.salary > Mgr.salary
e.Name
Shideh
Kathy
2019/2/22