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Questions and Answers
What is the primary purpose of a view in a database?
What is the primary purpose of a view in a database?
Which of the following is NOT a type of semantic constraint?
Which of the following is NOT a type of semantic constraint?
What SQL command is used to create a view named 'TopStudents'?
What SQL command is used to create a view named 'TopStudents'?
What occurs when a semantic constraint of 'CHECK (MARKS BETWEEN 0 AND 100)' is in place?
What occurs when a semantic constraint of 'CHECK (MARKS BETWEEN 0 AND 100)' is in place?
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What is the role of triggers in a database?
What is the role of triggers in a database?
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Which statement accurately describes how triggers operate?
Which statement accurately describes how triggers operate?
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Which of the following examples illustrates a proper use of a view?
Which of the following examples illustrates a proper use of a view?
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How do domain constraints function in a database?
How do domain constraints function in a database?
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Study Notes
Views are virtual tables that simplify complex queries, organize data without altering underlying tables, and allow users to focus on relevant information, restrict access, and simplify joins. Example: CREATE VIEW TopStudents AS SELECT StudentDetails.S_ID, StudentDetails.NAME, StudentDetails.ADDRESS, StudentMarks.MARKS FROM StudentDetails JOIN StudentMarks ON StudentDetails.S_ID = StudentMarks.ID WHERE StudentMarks.MARKS > 80;
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Semantic Constraints ensure data integrity. Types include Domain Constraints (data type limits), Referential Integrity (consistent table relationships), and Assertions (truth conditions for rows). Example: CREATE TABLE StudentMarks (ID INT PRIMARY KEY, NAME VARCHAR(50), MARKS INT, AGE INT, CONSTRAINT chk_marks CHECK (MARKS BETWEEN 0 AND 100));
Triggers are procedures that execute automatically on database events (INSERT, UPDATE, DELETE) to maintain data integrity and enforce rules.
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Description
This quiz explores the concepts of views in databases and their role in simplifying complex queries. It also covers semantic constraints that ensure data integrity through various types of constraints. Test your understanding of how these elements function within a database structure.