Are views updatable?
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
Some views are updatable, but under strict structural criteria:
### Conditions for a View to Be Updatable:
- Must reference only one base table in the
FROMclause. - Cannot contain aggregate functions (
SUM,COUNT,AVG,MAX,MIN). - Cannot contain
DISTINCT,GROUP BY,HAVING, orUNION/UNION ALL. - Cannot use
LIMITin the view definition. - All underlying
NOT NULLcolumns without default values must be included in the view projection so thatINSERTstatements can populate required fields.
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.