4.1 Quality data is needed for useful information to be extracted from a database - NSC Information Technology - Question 4 - 2016 - Paper 2

An update anomaly occurs when changes made to a data item in a table do not propagate to all related records in the database. This can lead to data inconsistency, as the related records may not be updated correctly, leaving some information outdated or incomplete.

A DBMS on a server allows for centralized management of the database, enabling multiple users to access and manipulate the database concurrently without direct access to the database itself. This enhances security and simplifies database administration.

A database administrator is responsible for managing and maintaining the database, which includes overseeing user access, optimizing performance, and ensuring data security and integrity.

1. Designing and implementing database queries: This involves creating, modifying, and optimizing SQL queries to ensure efficient data retrieval.

2. Analyzing data requirements: A database analyst assesses the needs and usage of data within the organization, ensuring that the database structure meets the users' needs.

A potential solution could be to implement data warehousing techniques such as partitioning or normalization, which helps in organizing data more efficiently and reducing redundancy, thus minimizing the overall size of the database.

The StandNo field in the tblStands table is the primary key, which means it must contain unique values for each record. As a result, the database design enforces that no two records can have the same StandNo, effectively preventing multiple exhibitors from being allocated the same stand.

SELECT StandNo FROM tblStands WHERE PlugPoint = 'Yes';

UPDATE tblStands SET Assistants = Assistants + 1;

DELETE FROM tblStands WHERE StandNo = 'B02';