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skills/query-expert/references/indexing.md

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+# Indexing Strategies - See SKILL.md for complete indexing guide including:
+- When to create indexes
+- Composite index column order
+- Covering indexes
+- Partial/filtered indexes
+- Index types (B-Tree, Hash, GIN, GiST)
+- Index maintenance

skills/query-expert/references/nosql_queries.md

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+# NoSQL Queries - See SKILL.md for complete NoSQL guide including:
+- MongoDB find() queries
+- MongoDB aggregation pipelines
+- MongoDB indexes
+- GraphQL queries
+- Query optimization for NoSQL

skills/query-expert/references/optimization.md

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+# Query Optimization - See SKILL.md for complete optimization guide including:
+- Avoid SELECT *
+- Use indexes effectively
+- Optimize JOINs
+- EXISTS vs IN
+- Function usage on indexed columns
+- LIMIT and pagination
+- Batch operations
+- Common anti-patterns

skills/query-expert/references/sql_patterns.md

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+# SQL Query Patterns - See SKILL.md for complete SQL guide including:
+- SELECT queries with JOINs
+- Aggregation with GROUP BY
+- Window functions
+- CTEs (Common Table Expressions)  
+- Subqueries
+- Best practices and anti-patterns