DML includes?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of SQL & Databases conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
DML stands for Data Manipulation Language. DML commands manage, insert, retrieve, and modify actual data rows stored inside database tables:
### Core DML Statements:
SELECT: Retrieves data from one or more tables.INSERT: Inserts new data rows into a table (INSERT INTO ... VALUES).UPDATE: Modifies existing data values (UPDATE ... SET ... WHERE).DELETE: Removes existing data rows (DELETE FROM ... WHERE).
Unlike DDL, DML statements operate inside transactional contexts and can be rolled back before a COMMIT.
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.