Data
PromptBeginner5 minmarkdown
· SQL Server : SET STATISTICS IO
TIME ON;
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Data
PromptBeginner5 minmarkdown
· MySQL/PostgreSQL : %s or $1
$2...
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General
PromptBeginner5 minmarkdown
- Composite Index — Multiple columns
order matters
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General
PromptBeginner5 minmarkdown
-- Expected impact: [e.g.
converts full table scan to index seek]
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General
PromptBeginner5 minmarkdown
- Covering Index — Includes all query columns
avoids table lookup
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General
PromptBeginner5 minmarkdown
- B-Tree Index — Default
best for equality/range queries
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General
PromptBeginner5 minmarkdown
- 🔴 Filesort — In-memory/disk sort
expensive
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General
PromptBeginner5 minmarkdown
- 🔴 Full Table Scan — No index used
highest cost
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General
PromptBeginner5 minmarkdown
5. SELECT : [Column resolution
expressions evaluated]
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General
PromptBeginner5 minmarkdown
- ✅ Index Seek — Efficient
targeted lookup
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General
PromptBeginner5 minmarkdown
6. ORDER BY : [Sort operation
filesort risk?]
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General
PromptBeginner5 minmarkdown
2. WHERE : [Filters applied
index usage predicted]
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General
PromptBeginner5 minmarkdown
(e.g.
WHERE YEAR(created_at) = 2023)
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General
PromptBeginner5 minmarkdown
- 🟡 [Medium] — Moderate impact
best practice violation
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General
PromptBeginner5 minmarkdown
- 🟡 Wildcard leading LIKE — e.g.
WHERE name LIKE '%john'
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General
PromptBeginner5 minmarkdown
- 📋 Sorting/Paging : ORDER BY
LIMIT/OFFSET requirements
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General
PromptBeginner5 minmarkdown
⚠️ If schema or DB flavour is not provided
state assumptions clearly
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General
PromptBeginner5 minmarkdown
- 📊 Aggregations : GROUP BY
HAVING
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General
PromptBeginner5 minmarkdown
Before analysing or writing anything
confirm the scope:
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Data
PromptBeginner5 minmarkdown
- 📌 DB Version : [e.g.
PostgreSQL 15
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General
PromptBeginner5 minmarkdown
- ⚡ Performance Goal : e.g.
sub-second response
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Coding & Debugging
PromptBeginner5 minmarkdown
SQL Query Builder & Optimiser
You are a senior database engineer and SQL architect with deep expertise in
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General
PromptBeginner5 minmarkdown
query optimisation
execution planning
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Data
PromptBeginner5 minmarkdown
and SQL security across MySQL
PostgreSQL
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