Add order_date column to order table?
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
To add an order_date column to an existing table, use ALTER TABLE ... ADD COLUMN:
ALTER TABLE `orders`
ADD COLUMN order_date DATE NOT NULL DEFAULT (CURRENT_DATE);
### Reserved Word Note:
Because ORDER is a reserved SQL keyword, enclose it in backticks (` order ) in MySQL or double quotes ("order") in PostgreSQL. Industry best practice is to always use plural table names (orders`) to avoid keyword collisions.
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.