MCQ
DBMS MCQ - Practice Questions with Answers
Solve 3 DBMS questions for RAS/RPSC preparation.
Practice questions
Q1Let relation R2 has a ‘foreign key’ that refers to primary key of relation R1. Which of the following operation may cause violation of referential integrity constraints?
A foreign key value in the child relation must match an existing primary-key value in the parent relation. Inserting a tuple into R2 can violate this if its foreign key has no matching R1 row, and deleting a tuple from R1 can violate it if R2 still refers to that parent row. Therefore, both operations may violate referential integrity, so option C is correct.
Q2An entity is represented by set of -
In the ER model, an entity is described by a set of attributes. Attributes store the properties of that entity, such as name, roll number, or address for a student entity. Relationships connect entities, so option B does not represent an entity by itself.
Q3Which of the following events is/are exposed by the DataTable object?
Microsoft's DataTable event list includes RowChanged, ColumnChanged, and RowChanging. Since all three listed events are exposed by the DataTable object, the combined choice is correct. Therefore, option D is correct.
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