By Jennifer Widom, Jeffery D. Ullman
Significant due to Leo over at MAM for this rip
For Database structures and Database layout and alertness classes provided on the junior, senior, and graduate degrees in laptop technological know-how departments.
Written through recognized laptop scientists, this available and succinct creation to database structures specializes in database layout and use. The authors offer in-depth assurance of databases from the perspective of the database fashion designer, consumer, and alertness programmer, leaving implementation for later classes. it's the first database platforms textual content to hide such subject matters as UML, algorithms for manipulating dependencies in family members, prolonged relational algebra, Hypertext Preprocessor, 3-tier architectures, info cubes, XML, XPATH, XQuery, XSLT.
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Extra info for A First Course in Database Systems (3rd Edition)
2. DROP followed by an attribute name. 4: Thus, for instance, we could modify the MovieStar relation by adding an attribute phone with: ALTER TABLE MovieStar ADD phone CHAR(16); As a result, the MovieStar schema now has five attributes: the four mentioned in Fig. 8 and the attribute phone, which is a fixed-length string of 16 byte In the actual relation, tuples would all have components for phone, but we know of no phone numbers to put there. Thus, the value of each of these components is set to the special null value, NULL.
3. DEFINING A RELATION SCHEMA IN SQL 37 b) A suitable schema for relation PC. c) A suitable schema for relation Laptop. d) A suitable schema for relation P r i n t e r . e) An alteration to your P r i n t e r schema from (d) to delete the attribute color. , cd or dvd). Let the default value for this attribute be 'none* if the laptop does not have an optical disk. 2 : This exercise introduces anot her running example, concerning World War II capital ships. It involves the following relations: C l a s s e s ( c l a s s , t y p e , country, numGuns, bore, displacement) Ships(name, c l a s s , launched) Battles(name, date) Outcomes(ship, b a t t l e , r e s u l t ) Ships are built in "classes" from the same design, and the class is usually named for the first ship of that class.
Unless one of them is NULL. Am attempt to insert or update a tuple that violate this rule causes the DBMS to reject the action that caused the violation. In addition, if PRIMARY KEY is used, then attributes in S are not allowed to have NULL as a value for their components. Again, any attempt to violate this rule is rejected by the system. NULL is permitted if the set S is declared UNIQUE, however. A DBMS make make other distinctions between the two terms, if it wishes. 6: Let us reconsider the schema for relation MovieStax.
A First Course in Database Systems (3rd Edition) by Jennifer Widom, Jeffery D. Ullman