Database Processing: David M. Kroenke’s Chapter Seven: Fundamentals, Design, and Implementation Chapter Seven: SQL for Database Construction and Application Processing Part One DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

View Ridge Gallery View Ridge Gallery is a small art gallery that has been in business for 30 years . It sells contemporary European and North American fine art. View Ridge has one owner, three salespeople, and two workers. View Ridge owns all of the art that it sells; it holds no items on a consignment basis. DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

Application Requirements View Ridge application requirements: Track customers and their artist interests Record gallery's purchases Record customers' art purchases List the artists and works that have appeared in the gallery Report how fast an artist's works have sold and at what margin Show current inventory in a Web page DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

View Ridge Gallery Database Design DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

SQL DDL and DML DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

The Database Design for ARTIST and WORK DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

CREATE TABLE CREATE TABLE statement is used for creating relations Each column is described with three parts: column name, data type, and optional constraints Example: DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

Data Types DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

Constraints Constraints can be defined within the CREATE TABLE statement, or they can be added to the table after it is created using the ALTER table statement Five types of constraints: PRIMARY KEY may not have null values UNIQUE may have null values NULL/NOT NULL FOREIGN KEY CHECK DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

Creating Relationships DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

Implementing Cardinalities DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

Default Values and Data Constraints DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

SQL for Constraints DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

ALTER Statement ALTER statement changes table structure, properties, or constraints after it has been created Example: ALTER TABLE ASSIGNMENT ADD CONSTRAINT EmployeeFK FOREIGN KEY (EmployeeNum) REFERENCES EMPLOYEE (EmployeeNumber) ON UPDATE CASCADE ON DELETE NO ACTION; DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

Adding and Dropping Columns The following statement will add a column named MyColumn to the CUSTOMER table: ALTER TABLE CUSTOMER ADD MyColumn Char(5) NULL; You can drop an existing column with the statement: ALTER TABLE CUSTOMER DROP COLUMN MyColumn; DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

Adding and Dropping Constraints ALTER can be used to add a constraint as follows: ALTER TABLE CUSTOMER ADD CONSTRAINT MyConstraint CHECK ([Name] NOT IN ('Robert No Pay')); ALTER can be used to drop a constraint: ALTER TABLE CUSTOMER DROP CONSTRAINT MyConstraint; DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

Removing Tables If there are constraints: SQL DROP TABLE: DROP TABLE [TRANSACTION]; If there are constraints: ALTER TABLE CUSTOMER_ARTIST_INT DROP CONSTRAINT Customer_Artist_Int_CustomerFK; ALTER TABLE [TRANSACTION] DROP CONSTRAINT TransactionCustomerFK; DROP TABLE CUSTOMER; DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

SQL DML - INSERT INSERT command: Bulk INSERT: INSERT INTO ARTIST ([Name], Nationality, Birthdate, DeceasedDate) VALUES ('Tamayo', 'Mexican', 1927, 1998); Bulk INSERT: INSERT INTO ARTIST ([Name], Nationality, Birthdate) SELECT [Name], Nationality, Birthdate FROM IMPORTED_ARTIST; DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall

David M. Kroenke’s Database Processing Fundamentals, Design, and Implementation (10th Edition) End of Presentation: Chapter Seven Part One DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall