--- title: "Why Your SQL Is Slower Than It Should Be" url: https://daily.dev/posts/why-your-sql-is-slower-than-it-should-be-zteysuzy7 source_url: https://www.youtube.com/watch?v=kDyhijBjXTU type: video:youtube source: "Database Star" published: 2026-05-31T07:44:12.847Z updated: 2026-05-31T07:56:42.217Z tags: ["database", "sql"] reading_time: 8 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Why Your SQL Is Slower Than It Should Be **[Database Star](https://daily.dev/sources/database-star)** · 8 min read · 0 upvotes · 0 comments ## Summary Slow SQL queries are rarely caused by hardware or the database engine itself. Three main culprits are identified: poor query design (e.g., correlated subqueries, inefficient joins that don't scale), missing indexes (forcing full table scans as data grows), and poor database design (e.g., Entity-Attribute-Value models that become bottlenecks at scale). Solutions include rewriting queries using joins, subqueries, CTEs, or window functions; adding indexes on WHERE clauses, join conditions, and sort columns; and redesigning problematic schema patterns through denormalization or targeted structural changes. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [But I Added an Index\! Why Is My SQL Query Still Slow?](https://daily.dev/posts/but-i-added-an-index-why-is-my-sql-query-still-slow--tzn94gf7j) · Medium · 0 upvotes · 0 comments --- Tags: [#database](https://daily.dev/tags/database), [#sql](https://daily.dev/tags/sql) [View this post on daily.dev](https://daily.dev/posts/why-your-sql-is-slower-than-it-should-be-zteysuzy7)