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

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The 5 Queries I Run First When Postgres Is Slow

The 5 Queries I Run First When Postgres Is Slow

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3 min read
Exploring Window Functions, Joins, Subqueries and CTEs in SQL

Exploring Window Functions, Joins, Subqueries and CTEs in SQL

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10 min read
JOINs, Window Functions, CTEs, and Subqueries.

JOINs, Window Functions, CTEs, and Subqueries.

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7 min read
Introduction to SQL Window Functions, CTEs, Joins & Subqueries

Introduction to SQL Window Functions, CTEs, Joins & Subqueries

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12 min read
# SQL Essentials: Joins, Window Functions, CTEs, and Subqueries Using a Hospital Database

# SQL Essentials: Joins, Window Functions, CTEs, and Subqueries Using a Hospital Database

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20 min read
Your SKIP LOCKED Queue Can Run a Job Twice. Heartbeats and Fencing Tokens Make It Safe

Your SKIP LOCKED Queue Can Run a Job Twice. Heartbeats and Fencing Tokens Make It Safe

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9 min read
An Instant ADD COLUMN Waiting on One Slow SELECT Blocks Every Query Behind It

An Instant ADD COLUMN Waiting on One Slow SELECT Blocks Every Query Behind It

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8 min read
SQL CONCEPTS - Window Functions, Joins, Common Table Expressions & Subqueries

SQL CONCEPTS - Window Functions, Joins, Common Table Expressions & Subqueries

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4 min read
Joins In SQL

Joins In SQL

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15 min read
Бухгалтерия на естественном языке: каким должен быть MCP-сервер

Бухгалтерия на естественном языке: каким должен быть MCP-сервер

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1 min read
SQL Server Interview Questions for Senior Developers in 2026 — Execution Plans, Indexing, Locking & Parameter Sniffing (Deep Answers)

SQL Server Interview Questions for Senior Developers in 2026 — Execution Plans, Indexing, Locking & Parameter Sniffing (Deep Answers)

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4 min read
Logging in PL/SQL that survives ROLLBACK (and 4 mistakes to avoid)

Logging in PL/SQL that survives ROLLBACK (and 4 mistakes to avoid)

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3 min read
SQL for Hospital Data Analysis: Window Functions, Joins, CTEs, and Subqueries

SQL for Hospital Data Analysis: Window Functions, Joins, CTEs, and Subqueries

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14 min read
Convert CSV to SQL INSERT Statements Quickly (Without Breaking Your Data)

Convert CSV to SQL INSERT Statements Quickly (Without Breaking Your Data)

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4 min read
Your hiring chart may measure who posts most often

Your hiring chart may measure who posts most often

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7 min read
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