
SQL Quiz
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Casey Gordon
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19 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In an entity-relationship diagram, what is the purpose of a weak entity?
To represent an entity that does not have its own unique identifier.
To represent an entity that has a one-to-one relationship with another entity.
To represent an entity that has a many-to-many relationship with another entity.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the CASCADE DELETE constraint in SQL?
To automatically delete all related records when a record is deleted.
To prevent the deletion of a record if it is referenced by other records.
To update the foreign key values when a record is deleted.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the EXISTS operator in SQL?
To check if a subquery returns any rows.
To perform calculations on the retrieved data.
To retrieve data based on the result of another query.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can a self-referencing relationship be implemented in a relational database?
By creating a separate table that includes the primary key of the entity.
By adding a foreign key column in the entity's table that references its own primary key.
By duplicating the data in the entity's table.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the HAVING clause in SQL?
To filter rows based on a specific condition.
To sort rows in ascending or descending order.
To filter groups based on a specific condition.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the TRUNCATE TABLE command in SQL?
To modify the structure of an existing table.
To insert new rows into a table.
To delete all rows from a table.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can the JOIN operation be used in SQL?
To combine rows from two or more tables based on a related column between them.
To update existing data in a table.
To delete rows from a table.
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