By Hermann Maurer, Nick Scherbakov, Zahran Halim, Zaidah Razak
This textbook is greater than a regular advent to databases: it's a complete set of instruments that makes the instructing and studying of uncomplicated evidence approximately databases and hypermedia a lot more uncomplicated. On an undergraduate point the elemental principles of relational, object-oriented, and hypermedia information versions and databases are defined, either in revealed shape with many illustrations and within the type of 26 "lessons" of courseware. This relieves the teacher of a lot of the weight of getting ready transparencies, and permits the scholars to copy or learn lecture fabric in digital shape that follows precisely the revealed presentation. Please be aware that the software program runs on home windows structures only!
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Additional resources for From Databases to Hypermedia: With 26 CAI Lessons
When relations make references to another relation via foreign keys, the database management system must ensure that data between the relations are valid. For example, Transaction cannot have a tuple with a C# value that is not found in the Customer relation for the tuple would then be referring to a customer that does not exist. Thus, for referential integrity a foreign key can have only two possible values - either the relevant primary key or a null value. No other values are allowed. Figure 3-8: Referential integrity violation Figure 3-8 above shows that by adding a tuple with C# 4 means that we have a foreign key that does not reference a valid key in the parent Customer relation.
End users may feel uncomfortable with computers or may simply be not interested in the technical details, but their lack of knowledge should not be a handicap to the main job which they have to do. g. g. "Produce the monthly cash flow analysis report") 26 3. Data Updating Facilities 2. Database specialists: Specialist users are knowledgeable about the technicalities of the database management system. They are likely to hold positions such as the database administrator, database programmer, database support person, systems analyst or the like.
To delete an existing tuple An existing customer no longer does any business with the company, in which case, the corresponding tuple must be erased from the customer database. Stepl. The user chooses the relation, Customer. Step 2. The user issues a DML command to retrieve the tuple to be deleted. Step 3. The DBMS deletes the tuple from the relation. The updated relation now has one less tuple. Customer C# Cname cit lwne 1 Codd London 2263035 2 Martin Paris 5555910 4 LaJl1Il Graz 832551 3. To modify an existing tuple An existing customer has moved to a new location (or that the current value in the data field is incorrect).
From Databases to Hypermedia: With 26 CAI Lessons by Hermann Maurer, Nick Scherbakov, Zahran Halim, Zaidah Razak