Data Engineering Associate with Databricks Practice Exam

What function does the command 'DELETE FROM students WHERE value > 6' perform?

1. It removes records without conditions

2. It deletes records with a specific condition

3. It updates records based on conditions

4. It creates new records in the students table

The correct answer is: It deletes records with a specific condition

The command 'DELETE FROM students WHERE value > 6' is designed to delete records from the 'students' table that meet a specific condition—in this case, where the 'value' field is greater than 6. This means that only those records that satisfy this condition will be removed from the table, allowing for precise control over which entries to delete. This functionality is crucial in data management as it enables users to maintain data integrity and relevancy by removing outdated or irrelevant records without impacting other data in the table. The command acts selectively, ensuring that only the intended entries are affected, which is a fundamental aspect of SQL operations concerning data manipulation. In contrast, other options suggest actions that do not align with the function of the command. For example, deleting records without conditions would remove all entries from the table, which is not what this command does. Similarly, updating records would involve modifying existing data rather than removing it, and creating new records is not applicable in this context since the command specifically addresses deletion.