Beyond Nested Queries: A Practical Guide to SQL Subquery Flattening
Subquery flattening technique eliminates derived tables, boosting SQL performance by 37.57% in SAP financial query case study.
Rebooter.S
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6 min
Tag: SQL Performance
12 posts
Optimize MySQL OR Conditions: A UNION Rewrite Guide
MySQL OR Condition Optimization: A Practical Guide to Performance Improvement with UNION Rewrite
Rebooter.S
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8 min
MySQL COUNT Scalar Subquery Optimization: The Complete Guide
This article demonstrates how optimizing COUNT subqueries to IN clauses boosts MySQL performance by 99%, with detailed examples and execution plan analysis.
Rebooter.S
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5 min
MySQL OR Condition to UNION ALL
This article demonstrates how optimizing MySQL OR conditions with UNION ALL significantly improves query performance, based on experimental results and execution plan analysis.
Rebooter.S
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6 min
5 Steps to Optimize MySQL Deep Pagination
This article explores MySQL deep pagination optimization using Deferred Join technique, demonstrating 80.3% faster query performance with 99.99% fewer back-to-table operations through comprehensive testing.
Rebooter.S
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5 min
How to Upgrade from MySQL 8.0 to 8.4 LTS?
MySQL Update guide: Safely upgrade from MySQL 8.0 to 8.4 LTS with step-by-step instructions, compatibility checks, and data protection tips.
SQLFlash
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10 min
10 Most Common SQL Interview Questions and How to Answer Them​
Prepare for your SQL Interview with the top 10 questions and expert answers covering joins, constraints, normalization, and query optimization.
SQLFlash
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20 min
DuckDB vs PostgreSQL Which Analytical Database Is Better in 2025​
Compare DuckDB vs PostgreSQL for OLAP analytical database needs in 2025. See which offers better performance, scalability, and integration for analytics.
SQLFlash
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13 min
DuckDB vs. ClickHouse: A Comparative Analysis for Analytical Workloads​
Compare duckdu clickhouse OLAP Database options for analytics. See which excels in performance, scalability, and integration for your workload needs.
SQLFlash
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15 min
Lesson 36 of the SQL Optimization Course: Time-Based Partitioning Case Study
Time-based partitioning in MySQL optimizes query performance for large datasets by enabling partition pruning and automated data lifecycle management.
ytt
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7 min