CSE 312, DIU MOHSHI MASNAD 1
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CSE 312, DIU
MOHSHI MASNAD
1
What we have done so far……..
LOGICAL TESTS
AGGREGATE FUNCTIONS (BASIC)
JOINING OPERATIONS
SIMPLE SUB QUERY
SET OPERATIONS
GROUP BY
HAVING
2
What we are going to learn.…
ALIASES
SET COMPARISONS
CHECKING EMPTY RELATION
VIEW
INTEGRITY CONSTRAINTS
CHECK
Primary Key
Foreign Key
3
Our Tables
4
ALIASES12
5
SET
comparisons13
6
SET
comparisons13
7
SET
comparisons13
8
check for
EMPTY13
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Similarly NOT EXISTS can be used if necessary
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User 1
User 2
ID Name Address Age
Select ID , Name from Orginal_Table
Select Name, Address, Age from Orginal_Table
Boss of
Orginal_Table
Scenario 1
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User 1
User 2
ID Name Address Age
Boss of
Orginal_Table
VIEW of the Desired
portion of Original_Table
VIEW of the Desired
portion of Original_Table
A1 A2 A3 A4 A5
B1 B2 B3
C1 C2
Scenario 2
A1 A2 A3 A4 A5
B1 B2 B3
C1 C2
Intermediate Table
(VIEW)
Result
Scenario 2
The
VIEW14
The
VIEW14
The
VIEW14
The
VIEW14
The
VIEW14
CONSTRAINTOn a single relation
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NOT NULL
UNIQUE
CHECK
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PRIMARY KEY
20
16
PRIMARY KEY
21
16
PRIMARY KEY
22
16
PRIMARY KEY
23
16
Referential Integrity
THE FOREIGN KEY
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Attribute 3
10
11
11
12
12
Attribute 1
10
11
12
Table_1 (CHILD)
Table_2 (PARENT)
FOREIGN KEY
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Referential Integrity
THE FOREIGN KEY
25
17
Referential Integrity
THE FOREIGN KEY
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17
Referential Integrity
THE FOREIGN KEY
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17
Referential Integrity
THE FOREIGN KEY
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17
NAMING
CONSTRAINTS
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18
DROPPING A TABLE
with constraints
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20
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DROPPING A TABLE
with constraints20
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ALTER : changing the table structure21
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ALTER : changing the table structure21
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ALTER : changing the table structure
The clause cascade automatically
disables foreign key constraints that depend
on the (disabled) primary key
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CLASS
TASK
1.Create a view showing the students’ ID and their corresponding number of phone no. entries.
2.Write any SQL example using NOT EXIST.3.Find out the ID of the students whose semesters are above all the
semesters of the students who have informed their blood group and contact information.
4.From (3), If at least 1 result is found, then show their CGPA’s .5.Create DEPARTMENT and EMPLOYEE tables according to given
schema and design with appropriate constraints (unique, not null,
check and primary key)
6.Now put referential integrity where necessary.7.Add a new column EMP_AGE in EMPLOYEE table.
8.Impose ON DELETE CASCADE and check deletion.
STUDENT (ID, NAME, SEMESTER, DATE_OF_BIRTH)
STUDENT _RESULT (ID, CGPA)
STUDENT _CONTACT (ID, PHONE_NO)
STUDENT _BLOOD_GROUP (ID, B_GROUP)
DEPARTMENT (DEPT_ID, DEPT_NAME)
EMPLOYEE (EMP_ID, EMP_NAME, EMP_DEPT)
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