In every relational database, there are four basic operations that users use to manipulate the data that is stored in a database. These basic operations include______. A. selecting, joining, linking, update B. selecting, querying, projecting, linking C. selecting, projecting, joining, linking D. selecting, projecting, joining, moving
Question
In every relational database, there are four basic operations that users use to manipulate the data that is stored in a database. These basic operations include______. A. selecting, joining, linking, update B. selecting, querying, projecting, linking C. selecting, projecting, joining, linking D. selecting, projecting, joining, moving
Solution
The correct answer is C. selecting, projecting, joining, linking. These are the four basic operations that users use to manipulate the data that is stored in a relational database.
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Selecting: This operation is used to choose a subset of the tuples from a relation that satisfies a selection condition.
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Projecting: This operation is used to choose certain columns from the table and discard the other columns.
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Joining: This operation is used to combine related tuples from two different relations into single “longer” tuples.
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Linking: This operation is used to establish connections between two or more database tables based on common fields.
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