Routine queries to a relational database often require data from more than one file. For example, to obtain the names of customers who purchased a particular product, data must be extracted from ...

Any data that does not fall into the traditional field structure (alpha, numeric, dates) of a relational DBMS. Examples of complex data types are bills of materials, word processing documents ...

Because of this, mistakes are less likely to happen and if there were a mistake in a customer's record, for example, correcting it will correct the mistake database-wide. Duplication is avoided ...

In a relational database, it is necessary to define the ... There are two ways to do this: In these examples the words 'is used on' appear on the line that shows the relationship between the ...

This module covers DBMS essentials such as concurrency management, backup & recovery, and transaction logging. We have learned to design a Relational Database around the typical transactions or ...

The following automatic macro variables are portable, but their values are determined by the SAS/ACCESS engine and your DBMS. Initially, the macro variables SYSDBMSG and SQLXMSG are blank, whereas ...