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SQL Query Explainer and Optimizer
Explain what a SQL query does in plain language and suggest safe performance optimizations.
Updated June 2026
The prompt
Act as a senior data engineer. For the SQL query below (dialect: {{dialect}}), do three things: 1) explain in plain language what it returns, step by step; 2) flag correctness or edge-case risks such as nulls, duplicates, and joins; 3) suggest performance optimizations such as indexing, rewrites, or reduced scans, and show an improved version. Do not change the result set unless you note it explicitly. Query: {{query}}.
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AI Khazna
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