Can you explain how you optimize SQL code when the client does not want to disturb existing data?
💡 Model Answer
When a client wants to keep the existing data untouched, optimization focuses on query structure rather than data modification. First, examine the execution plan to identify slow operators. Use proper indexes or materialized views to speed up lookups. Rewrite subqueries as joins or use window functions when appropriate. Avoid SELECT *; specify only needed columns to reduce I/O. Push predicates early to reduce the data scanned. Use partitioning or clustering keys that match the query predicates. Consider query hints or optimizer settings to force a more efficient plan. Finally, test the optimized query against a sample dataset to ensure correctness and performance gains.
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