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

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Why OFFSET Pagination Is Killing Your PostgreSQL Queries (And How to Implement Keyset Pagination in Node.js)

Why OFFSET Pagination Is Killing Your PostgreSQL Queries (And How to Implement Keyset Pagination in Node.js)

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11 min read
77.1% on BIRD dev with one model call per question, and a test-set submission in

77.1% on BIRD dev with one model call per question, and a test-set submission in

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2 min read
Data Engineering Log 3/3: Data Storage and Queries

Data Engineering Log 3/3: Data Storage and Queries

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1 min read
Filtering Data in SQL: A Beginner’s Guide to WHERE using AND, OR, LIKE and Friends

Filtering Data in SQL: A Beginner’s Guide to WHERE using AND, OR, LIKE and Friends

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4 min read
To SQL or to Python; there is another problem

To SQL or to Python; there is another problem

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6 min read
BETWEEN can double-count a fact at an SCD2 version boundary

BETWEEN can double-count a fact at an SCD2 version boundary

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4 min read
An old event timestamp can still leak future information into training data

An old event timestamp can still leak future information into training data

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4 min read
Stripe reconciliation: carrying September into October

Stripe reconciliation: carrying September into October

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4 min read
PAM, BLOSUM and scoring matrices from 1,000 human mitochondrial genomes

PAM, BLOSUM and scoring matrices from 1,000 human mitochondrial genomes

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46 min read
GROUP BY In PostgreSQL

GROUP BY In PostgreSQL

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3 min read
Convert Time Columns into Rows and Pivot into a New Cross Table

Convert Time Columns into Rows and Pivot into a New Cross Table

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7 min read
SQL Concepts Using Hospital Data

SQL Concepts Using Hospital Data

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15 min read
5 SQL Window-Function Exercises Taken From Real Business Problems

5 SQL Window-Function Exercises Taken From Real Business Problems

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3 min read
Writing SQL in Go Without Losing Type Safety: An Introduction to sqlc

Writing SQL in Go Without Losing Type Safety: An Introduction to sqlc

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2 min read
Your average response time is lying to you (use p95 and p99)

Your average response time is lying to you (use p95 and p99)

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3 min read
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