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

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MariaDB to MySQL Migration: Which Schema Features Break, and How to Find Them First

MariaDB to MySQL Migration: Which Schema Features Break, and How to Find Them First

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12 min read
Your priority account count is not your A-grade count

Your priority account count is not your A-grade count

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7 min read
I built a MySQL practice lab on SQLite in the browser. Here is where the two disagree

I built a MySQL practice lab on SQLite in the browser. Here is where the two disagree

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3 min read
Claude for business: testing three Claude models as SQL agents on a CRM

Claude for business: testing three Claude models as SQL agents on a CRM

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7 min read
INNER JOIN vs LEFT JOIN: Which Rows Survive?

INNER JOIN vs LEFT JOIN: Which Rows Survive?

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4 min read
Designing Fault-Tolerant API Through Idempotency

Designing Fault-Tolerant API Through Idempotency

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4 min read
Extract Email Domains Using INSTR() and SUBSTR() in Oracle SQL

Extract Email Domains Using INSTR() and SUBSTR() in Oracle SQL

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2 min read
JSONB vs columns in PostgreSQL, measured on 2 million rows

JSONB vs columns in PostgreSQL, measured on 2 million rows

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7 min read
Best Bank Statement Converter: How to Test a Parser With Tie-Outs

Best Bank Statement Converter: How to Test a Parser With Tie-Outs

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9 min read
10 SQL Interview Questions for Data Engineers (2027), with Answers

10 SQL Interview Questions for Data Engineers (2027), with Answers

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7 min read
Como aprendi Apache Spark — Parte 18: Performance Tuning avançado

Como aprendi Apache Spark — Parte 18: Performance Tuning avançado

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17 min read
My "latest 20 issues" query read 200,000 rows, even with an index on project_id

My "latest 20 issues" query read 200,000 rows, even with an index on project_id

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3 min read
SQL WHERE vs HAVING: Differences, Execution Order and When to Use Each (Tested Examples)

SQL WHERE vs HAVING: Differences, Execution Order and When to Use Each (Tested Examples)

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11 min read
Free Endpoint First or Self-Hosted First? Deciding Where an Agent Drafts SQL

Free Endpoint First or Self-Hosted First? Deciding Where an Agent Drafts SQL

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5 min read
Catch an order-total mismatch with one SQL query

Catch an order-total mismatch with one SQL query

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1 min read
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