1. Recap of SQL Lab no 8 Advance Database Management System

2. Outline Revision of SQL Commands –Insert –Update –Delete

3. INSERT Statement There are two types of INSERT statements –One row at a time can be inserted in tables. Specify values for each column with the VALUES Clause –Multiple rows can be inserted in a single INSERT Statement.

4. INSERT INTO Customer ( CustID, Name, Address, Phone ) VALUES ( 101, ‘Ali Khan’, ’21 Sabzazar Karachi’, ’092- 021-8311865’ )

5. Example – One row at a time INSERT INTO Customer ( CustID, Name, Address, Phone ) VALUES ( 101, ‘Ali Khan’, ’21 Sabzazar Karachi’, ’092-021-8311865’ )

6. Example – One row at a time INSERT INSERT INTO Customer VALUES ( 101, ‘Ali Khan’, ’21 Sabzazar Karachi’, ’092-021-8311865’ )

7. Example – Multiple rows INSERT INSERT INTO DBMSStudent SELECT * FROM Student WHERE StdMajor = ‘DBMS’

8. UPDATE Statement There can be 2 types of UPDATE statements –Single column update –Multiple column update

9. Single Column UPDATE UPDATE Employee SET EmpSalary=EmpSalary*5 WHEREEmpDept=‘Finance’ Note: All Employees of Finance Dept got five times raise in salary

10. Multiple Columns UPDATE UPDATE Employee SET EmpLastName=‘Homer’, EmpPhone=’92-51-223123’, EmpDept=‘Accounts’ WHEREEmpDept=‘Finance’

11. Multiple Columns UPDATE UPDATE Student SET StdMajor=‘Computer Engineering’, StdSession= ‘2k3-CP’ Notice there is no WHERE condition

12. DELETE Statement There are 2 types of DELETE statements –Selected rows DELETE –All rows DELETE

13. Example - Selected Rows DELETE DELETE FROM Student WHERE StdMajor=‘IS’ AND StdSession=‘Fall04’

14. Example - Selected Rows DELETE DELETE statement Using Join Operator DELETE Offering.* FROM Offering INNER JOIN Faculty ON Offering.FacID=Faculty.FacID WHERE FacFisrtName=‘John’ ANDFacLastName=‘Barron’ Note: Used when rows of a table reference other tables

15. Example – All rows DELETE DELETE FROM DBMSStudent

16. DELETE and UPDATE actions for Referenced Rows Deleting a referenced row : What happens to related rows (in foreign key table) when referenced rows are deleted Updating the PK of a referenced row: What happens to related rows when the primary key of the referenced row is updated

17. Things to done … Some ACTIONS must be applied on referenced rows of the tables in CREATE TABLE statements Restrict (NO ACTION) Cascade (CASCADE) Nullify (SET NULL) Default (SET DEFAULT)

18. Example CREATE TABLE Enrollment ( EnrID INTEGER NOT NULL, Stdid CHAR(11) NOT NULL, Enrgrade DECIMAL(3,2) CONSTRAINT PKEnrID PRIMARY KEY(EnrID), CONSTRAINT FKStdid FOREIGN KEY(STDid) REFERENCES Student ON DELETE NO ACTION ON UPDATE CASCADE )