WGU D427 Data Management Applications OA Exam Practice Questions

The primary purpose of a DBMS is to provide a way to store, retrieve, and manage data in databases efficiently and securely.

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SQL (Structured Query Language) is a standard programming language used to manage and manipulate relational databases.

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A primary key is a unique identifier for each record in a database table, ensuring that no two records have the same primary key value.

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A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table. It establishes a link between the data in the two tables.

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Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity by dividing large tables into smaller, related tables.

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A SQL JOIN operation is used to combine rows from two or more tables based on a related column between them.

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INNER JOIN returns only the rows that have matching values in both tables, while OUTER JOIN returns all rows from one table and the matched rows from the other table. If there is no match, NULL values are returned for columns from the table without a match.

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A database transaction is a sequence of operations performed as a single logical unit of work, which must be either fully completed or fully aborted.

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