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Chapter 6

Chapter 6. SQL: Data Definition Thomas Connolly, Carolyn Begg, Database System , A Practical Approach to Design Implementation and Management, 4 th Edition, Addison Wesley Pg 157~ 195. Learning Outcomes. The ISO SQL data types Integrity Enhancement Feature Views Transactions

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Chapter 6

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  1. Chapter 6 • SQL: Data Definition • Thomas Connolly, Carolyn Begg, Database System, A Practical Approach to Design Implementation and Management, 4th Edition, Addison Wesley • Pg 157~ 195

  2. Learning Outcomes • The ISO SQL data types • Integrity Enhancement Feature • Views • Transactions • Discretionary Access Control

  3. String Data Types • Boolean data: true, false, null, unknown value (true > false) • Character data • Fixed length: CHAR(4) • Variable length: VARCHAR(30) • Bit data: binary string • BIT(4)

  4. Numeric Data Types • NUMERIC or NUMBER [precision, [scale]] • DECIMAL or DEC [precision, [scale]] • INTEGER or INT • SMALLINT (32,767) • FLOAT [precision] • REAL • DOUBLE PRECISION

  5. Datetime data • DATE: year, month, day (DD-MON-YY) • TIME [timeprecision (for second, default=0)] [with time zone (control hour and minute)]: hour:minute:second a.m. or p.m. • TIMESTAMP [timeprecision (for second, default=6] [with time zone (control hour and minute)]: date and times (DD-MON-YY hour:second:minute a.m. or p.m.)

  6. Integrity Enhancement Feature • Required data • Domain constraint • Entity integrity constraint • Referential integrity constraint • Enterprise constraint

  7. Required Data • Position VARCHAR(10) NOT NULL

  8. Domain Constraint - I • CHECK (search condition) • sex CHAR(1) NOT NULL CHECK (VALUE IN (‘m’, ‘f’)) • credit AS NUMBER(3) CHECK (VALUE BETWEEN 0 AND 999) • major AS CHAR(3) DEFAULT ‘mis’ CHECK (VALUE IN (‘mis’, ‘man’, ‘act’, ‘obe’))

  9. Domain Constraint - II • CREATE DOMAIN domain name [AS] data type [DEFAULT default option] [CHECK (VALUE IN (search condition))] • CREATE DOMAIN sextype AS CHAR(1) DEFAULT ‘m’ CHECK (VALUE IN (‘m’,’f’)); • sex sextype NOT NULL • CREATE DOMAIN cnumber AS CHAR(2) CHECK (VALUE IN (SELECT cno FROM customer)); • cid cnumber NOT NULL • DROP DOMAIN domain name [RESTRICT l CASCADE] • DROP DOMAIN cnumber;

  10. Entity Integrity • PRIMARY KEY key name or key names NOT NULL • PRIMARY KEY sno NOT NULL • sno INTEGER NOT NULL UNIQUE • PRIMARY KEY (sno, classno, sdate) NOT NULL

  11. Referential Integrity • Referential action for ON UPDATE and ON DELETE • CASCADE • SET NULL • SET DEFAULT • NO ACTION • Examples • FOREIGN KEY hotelno REFERENCES hotel (hotelno) • FOREIGN KEY hotelno REFERENCES hotel (hotelno) ON DELETE SET NULL • FOREIGN KEY hotelno REFERENCES hotel (hotelno) ON UPDATE CASCADE

  12. Enterprise Constraint • Methods • CHECK clause • UNIQUE clause • CREATE ASSERTION statement • CREATE ASSERTION assertion name CHECK (assertion condition): for defining attribute constraint • CREATE ASSERTION toomuch CHECK (NOT EXIST (SELECT sno FROM enroll GROUP BY sno HAVING COUNT (*) >10));

  13. SQL DDL • CREATE • ALTER • DROP

  14. CREATE • SCHEMA • DOMAIN • TABLE • INDEX • VIEW

  15. ALTER • TABLE • DOMAIN

  16. DROP • SCHEMA • DOMAIN • TABLE • INDEX • VIEW

  17. CREATE Schema • CREATE SCHEMA [name | AUTHORIZATION creator-id] • DROP SCHEMA name [RESTRICT | CASCADE] • Examples • CREATE SCHEMA mis150 AUTHORIZATION tsai; • DROP SCHEMA mis150;

  18. SQL DDL For Table • CREATE TABLE table-name (colm data-type [NOT NULL][UNIQUE] [DEFAULT option][CHECK search-cond][,...],[PRIMARY KEY (colm [,colm])],[FOREIGN KEY (colm [,colm]) REFERENCES (parent-table)[colms])

  19. Create A New Table Example • CREATE TABLE student (stuid NUMBER(5) NOT NULL CHECK (VALUE BETWEEN 00001 AND 99999), stuname CHAR(10), major CHAR(10), credit NUMBER(3), CONSTRAINT pkstudent PRIMARY KEY (stuid));

  20. Create A New Table Example • CREATE TABLE faculty (facid NUMBER (5) NOT NULL, facname CHAR(10), dept CHAR(10), rank CHAR(3) CHECK (VALUE IN (‘F’,’Aso’, Ast’)), CONSTRAINT pkfaculty PRIMARY KEY (facid));

  21. Create A New Table Example • CREATE TABLE class (course# NUMBER(5) NOT NULL, facid NUMBER(5), sched CHAR(10), room CHAR(10), CONSTRAINT pkclass PRIMARY KEY (course#), CONSTRAINT fkclassfaculty FOREIGN KEY (facid) REFERENCES faculty (facid));

  22. Create A New Table Example • CREATE TABLE enrollment (course# NUMBER(5) NOT NULL, stuid NUMBER(5) NOT NULL, grade CHAR(10), CONSTRAINT pkenroll PRIMARY KEY (course#, stuid), CONSTRAINT fkenrollclass FOREIGN KEY (course#) REFERENCES class (course#), CONSTRAINT fkenrollstudent FOREIGN KEY (stuid) REFERENCES student (stuid));

  23. Create A New Table Example • CREATE DOMAIN PropertyNo AS SMALLINT; • CREATE DOMAIN StaffNo AS CHAR(5) CHECK (VALUE IN (SELECT Sno FROM Staff); • CREATE DOMAIN Prent AS DECIMAL(6,2) CHECK (VLAUE BETWEEN 0 AND 9999.99); • CREATE TABLE PropertyForRent (Pno PropertyNo NOT NULL, Sno StaffNo CONSTRAINT StaffNotTooMuch CHECK (NOT EXIST (SELECT Sno FROM PropertyForRent GROUP BY Sno HAVING COUNT (*) >10)) NOT NULL, Rent Prent NOT NULL, CONSTRAINT pkPropertyForRent PRIMARY KEY (Pno), CONSTRAINT fkPropertyForRentStaff FOREIGN KEY (Sno) REFERENCES Staff (Sno));

  24. SQL DDL For Table • DROP TABLE table-name [RESTRICT | CASCADE]; • ALTER TABLE table-name [ADD][MODIFY][COLUMN] colm data-type [NOT NULL][UNIQUE] [DEFAULT option][CHECK search-cond][,...] [DROP [COLUMN] colm [RESTRICT|CASCADE] [ALTER [COLUMN] SET DEFAULT default option] [ALTER [COLUMN] DROP DEFAULT]

  25. Example • ALTER TABLE enrollment MODIFY (grade NUMBER(3)); • ALTER TABLE enrollment ADD (datetake DATE not null); • DROP TABLE enrollment;

  26. SQL DDL For Table • ALTER TABLE table-name [ADD [CONSTRAINT[constrnt-name]]table-constrnt][DROP CONSTRAINT constrnt-name][RESTRICT | CASCADE]

  27. CREATE TABLE customer (lastname CHAR(20) NOT NULL, firstname CHAR(20) NOT NULL, customerid NUMBER(5) NOT NULL, address CHAR(10)); • ALTER TABLE customer ADD (CONTRAINT pkcustomer PRIMARY KEY (lastname, firstname)); • ALTER TABLE customer DROP CONSTRAINT pkcustomer; • ALTER TABLE customer ADD (CONTRAINT pkcustomer PRIMARY KEY (customerid));

  28. Example • CREATE TABLE purchaseorder (ponumber CHAR (5) NOT NULL, podate DATE CONTRAINT pkpurchasorder PRIMARY KEY (ponumber)); • CREATE TABLE puchaseorderlineitem (ponumber CHAR(5) NOT NULL, lineitem CHAR(5) NOT NULL, quantity NUMBER(5) NOT NULL, CONTRAINT pkpuchaseorderlineitem PRIMARY KEY (ponumber, lineitem)); • ALTER TABLE puchaseorderlineitem ADD (CONSTRAINT fkpolineitem FOREIGN KEY (ponumber) REFERENCES purchaseorder (ponumber)); • ALTER TABLE puchaseorderlineitem DROP (CONSTRAINT fkpolineitem);

  29. SQL DDL For Index • CREATE [UNIQUE] INDEX index-name ON base-table-name (column [ASC | DESC] [, ... ) • DROP INDEX index-name

  30. Example • CREATE INDEX studentname ON student (stuname DESC); • CREATE INDEX majorcredit ON student (major, credit); • DROP INDEX majorcredit;

  31. SQL DDL For View • CREATE VIEW view-name [(view-colm [, ...])] AS SELECT ... [WITH [CASCADE|LOCAL] CHECK OPTION] • DROP VIEW view-name [RESTRICT | CASCADE]

  32. Example • CREATE VIEW substudent (studentid, studentname, major) AS SELECT stuid, stuname, major FROM student; • CREATE VIEW productprofit (productid, productname, profit) AS SELECT productid, productname, sale-cost FROM inventory; • DROP VIEW productprofit;

  33. Advantage of View • Data independence • Currency • Improved security • Reduced complexity • Convenience • Customization • Data integrity

  34. Disadvantage of View • Update restriction • Structure restriction (new attribute in the base table) • Performance (complex views)

  35. Access Control • GRANT system-privilege [ALL PRIVILEGES] TO role-name [WITH GRANT OPTION] • GRANT object-privilege [ALL PRIVILEGES] ON [owner.] object-name TO role-name [WITH GRANT OPTION] • GRANT role-name TO user-name • REVOKE privilege FROM role-name • REVOKE role-name FROM user-name

  36. System Privileges • CREATE TABLE • CREATE VIEW • CREATE USER • ALTER INDEX

  37. Object Privileges • SELECT • INSERT • UPDATE • DELETE

  38. Examples • GRANT CREATE TABLE, CREATE VIEW, CREATE USER TO manager; • GRANT SELECT, INSERT, UPDATE, DELETE ON student TO manager; • GRANT manger TO tsai;

  39. REVOKE DELETE ON student FROM manager; • REVOKE manager FROM tsai;

  40. Points To Remember • Structured Query Language (SQL) • Data Definition Language (DDL) • Access Control

  41. Assignment • Review 5 • Read chapters 11 and 12 • Homework assignment (type question before the solution) • 5.18, 6.10, 6.11, 6.12, 6.13, 6.14, 6.15, 6.16 • Due date:

  42. Student (Stuid, Stuname, Major, Credits) • Class (Course#, Facid, Sched, Room) • Faculty (Facid, Facname, Dept, Rank) • Enrollment (Course#, Stuid, Grade)

  43. Branch (Bno, Area, City) • Staff (Sno, Name, Position, Sex, Salary, Bno) • Property_for Rent (Pno, Area, City, Type, Rooms, Rent, Ono, Sno, Bno) • Renter (Rno, Name, Max_Rent) • Owner ( Ono, Name,) • Viewing (Rno, Pno, Date)

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