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select * from SQL

Posts on tips and tricks, using and learning about SQL for database development and analysis.

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How Database Indexes Work (And Why Yours Might Be Useless)

How Database Indexes Work (And Why Yours Might Be Useless)

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6 min read
The SQL Worked Perfectly. The Data Was Wrong.

The SQL Worked Perfectly. The Data Was Wrong.

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5 min read
Why 'WHERE x = NULL' Never Works in SQL (And What to Use Instead)

Why 'WHERE x = NULL' Never Works in SQL (And What to Use Instead)

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3 min read
Optimizing an 18 TB Azure SQL Hyperscale Database — Part 5: Where AI Actually Helped

Optimizing an 18 TB Azure SQL Hyperscale Database — Part 5: Where AI Actually Helped

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6 min read
Two domains are 53% of the Databricks Data Engineer Associate exam

Two domains are 53% of the Databricks Data Engineer Associate exam

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4 min read
Shadow-Gate Your LLM-Generated SQL: A Replay Test Against a Frozen Fixture Database

Shadow-Gate Your LLM-Generated SQL: A Replay Test Against a Frozen Fixture Database

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6 min read
The Gap Between College SQL and Industry Reality When I was in college, I thought I knew databases.

The Gap Between College SQL and Industry Reality When I was in college, I thought I knew databases.

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3 min read
A New Model Dropped. Is It Actually Good at Your SQL? A 30-Minute Smoke Test

A New Model Dropped. Is It Actually Good at Your SQL? A 30-Minute Smoke Test

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4 min read
The text-to-SQL demo takes an afternoon. The other 90% is why you should buy it.

The text-to-SQL demo takes an afternoon. The other 90% is why you should buy it.

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3 min read
Running the same SQL checks in a browser, CLI and pull request

Running the same SQL checks in a browser, CLI and pull request

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3 min read
Your companies table is lying to you about when things happened

Your companies table is lying to you about when things happened

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2 min read
SEQUENCE vs IDENTITY in SQL Server: Choosing the Right Auto-Increment

SEQUENCE vs IDENTITY in SQL Server: Choosing the Right Auto-Increment

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6 min read
# 🔬 PostgreSQL Internals: What Is Actually Inside an 8 KB Page?

# 🔬 PostgreSQL Internals: What Is Actually Inside an 8 KB Page?

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5 min read
From Raw Tables to Business Insights: A SQL Workflow Every SaaS Team Can Use

From Raw Tables to Business Insights: A SQL Workflow Every SaaS Team Can Use

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5 min read
How to Comment in SQL: -- and /* */, and the Two Traps That Break a Query

How to Comment in SQL: -- and /* */, and the Two Traps That Break a Query

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9 min read
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