By Jennifer Widom, Jeffery D. Ullman
Titanic 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 computing device technology departments.
Written via famous desktop scientists, this obtainable and succinct creation to database structures makes a speciality of database layout and use. The authors supply in-depth assurance of databases from the viewpoint of the database dressmaker, consumer, and alertness programmer, leaving implementation for later classes. it's the first database structures textual content to hide such subject matters as UML, algorithms for manipulating dependencies in kinfolk, 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)
F) An alteration to your Ships relation from (b) to include the attribute yard Riving the shipyard where the ship was built. 4 CHAPTER 2. THE RELATION AI MODEL OF DATA An Algebraic Query Language In this section, we introduce the data-manipulation aspect of the relational model. Recall that a data model is not just structure; it needs a way to quer the data and to modify the data. To begin our study of operations on relation we shall learn about a special algebra, called relational algebra, that consists of some simple but powerful ways to construct new relations from given relation When the given relations are stored data, then the constructed relations can be answers to queries about this data.
Likewise, stars are represented by the key for MovieStar, with the attribute 1 called starName. Finally, notice that all three attribute are necessary to form a key. It is perfectly reasonable t*> suppose that relation Starsln could have two distinct tuples that agree in any two of the three attributes. For instance, a star might appear in two movies in one year, giving rise to two tuples that agreed in movieYear and starName. but disagreed in movieTitle. MovieExec 1 hit relation tells us about movie cutives.
It is typical to combine SQL with a conventional or host language and to pass data between the database and the conventional program via SQL calls. We discuss a numb of ways to make this connection, including embedded SQL, P< tl Stored Modules (PSM), Call-Level Interface (CLI), Java Databa Lnterconnectivity (JDBC), and PHP. P a r t III: S e m i s t r u c t u r e d D a t a Modelin g and P r o g r a m m i n g The pervasiveness of the Web has put a premium on the management of hierarchically structured data, because t he standards for the Web are based on in d, tagged elements (semisti*uctured data).
A First Course in Database Systems (3rd Edition) by Jennifer Widom, Jeffery D. Ullman