Data & SQL21 categories
Why is this query slow?
A query got sluggish and you want one lead, not a checklist.
Name the single most likely reason this query is slow, and the one check that would confirm it. One cause, not a list. Query:
Making it yours
- Paste your own material where the prompt asks for it. Everything above that line is instruction, not content.
- Delete any rule that does not apply to you. A shorter prompt that fits beats a thorough one that does not.
- If the answer comes back vague, add a line saying what you do not want. Constraints work better than encouragement.
Making queries faster. Diagnosing a slow query, reading the plan, and finding the smallest index that fixes it.
Related prompts
Make this slow query fasterA query that used to be fine now takes minutes.What index should this query have?A query does a sequential scan and you want the smallest index that fixes it.Read this query plan with meYou have an EXPLAIN output and no idea which line is the problem.Will this query use my index?You added an index and the plan still shows a sequential scan.Explain this query to me line by lineYou inherited a 200-line query and need to understand it before changing it.Write the query from a plain-language questionYou know exactly what you want to know and not how to express it in SQL.
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