In databases, what is the difference between a delete statement and a truncate statement?
Why this question is asked
This question assesses your technical knowledge of databases and SQL operations, specifically the understanding of data management. Interviewers aim to evaluate your grasp of crucial database concepts, as well as your ability to differentiate between operations that might impact data integrity and performance. By asking this, they can gauge your foundational expertise and how you apply it in practical scenarios.
How to answer it
Begin by highlighting the key differences: 'The DELETE statement removes specific rows from a table based on a condition, allowing for selective data removal, while the TRUNCATE statement removes all rows in a table without logging individual row deletions, making it faster but irreversible.' You could follow up with an example: 'For instance, if I need to remove all records older than a year, I would use DELETE. However, if I want to clear an entire table for reset purposes, I would choose TRUNCATE.' This demonstrates both understanding and practical application of each statement.
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