Unlimited web hosting - EMAIL CHAR VARYING(32) NULL, SKILLS CHAR VARYING(256) NULL
EMAIL CHAR VARYING(32) NULL, SKILLS CHAR VARYING(256) NULL ); CREATE TABLE ADVERTISEMENT ( ADVERTISEMENT_ID INTEGER PRIMARY KEY NOT NULL, BAND_ID INTEGER FOREIGN KEY REFERENCES BAND WITH NULL, MUSICIAN_ID INTEGER FOREIGN KEY REFERENCES MUSICIAN WITH NULL, DATE DATE FORMAT DD MON, YEAR MASK MM/DD/YYYY NOT NULL, TEXT MEMO NOT NULL ); Try It Out Field Level Business Rules for a Data Warehouse Database Model Figure 12-9 shows an ERD for the musician s data warehouse database model. Here s a basic approach to business rules field settings: 1. Individual field business rules (including defaults, CHECK constraints, display formats, and input masks) 2. Encoding business rules using some kind of stored database coding, if and where appropriate (usually CHECK constraint functions). Figure 12-9: Musicians, bands, and their online advertisements data warehouse database model. Artists artist_id merchandise_id (FK) genre_id (FK) instrument_id (FK) musician_name musician_phone musician_email band_name band_founding_date discography_cd_name discography_release_date discography_price show_date show_time venue_name venue_address venue_directions venue_phone advertisement_date advertisement_text Genre genre_id parent_id (FK) genre Merchandise merchandise_id type price Instrument instrument_id section_id (FK) instrument 377 Business Rules and Field Settings
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