Instructor's Manual for an Introduction to Database Systems by Date C.J.

By Date C.J.

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By Date C.J.

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Leads to a brief introduction to nested subqueries). Do not get into details of SQL view updating. • START TRANSACTION, COMMIT WORK, ROLLBACK WORK. No need to get into the effect of these operations on cursors yet (unless anyone asks)──that material's covered in Chapter 15. Don't mention SET TRANSACTION. Note: START TRANSACTION was added in SQL:1999; prior to that, transactions could be started in SQL only implicitly, a state of affairs that caused some grief. For reasons of backward compatibility, of course, it's still possible to start transactions implicitly, but I wouldn't get into this unless anyone asks about it.

Can't do joins over such columns ... Can't do GROUP BY on such columns ... And so on. * In other words, the question as to what data types are supported is orthogonal to the question of support for the relational model as such. " Not so! 3]. ────────── Copyright (c) 2003 C. J. 3 * Of course, it also prescribes one type generator, RELATION, but a type generator isn't a type. 34]; "a relational DBMS can support only ... 21]; and so on. 2 Values vs. Variables One of the great logical differences (see the preface).

Note: This definition is only approximate. A more precise definition is given in Chapter 9 (where, among other things, the point is stressed that a primary key is a set of columns and a primary key value is a set of values──in fact, a (sub)tuple). • Projection is a relational operation that extracts specified columns from a relation. Note: This definition is only approximate. A more precise definition is given in Chapter 7. • A proposition is, loosely, something that evaluates to either TRUE or FALSE, unequivocally.

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