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← All coursesGreen Pipelines, Wrong Numbers6 levels · 32 lessons

Success is a claim, not a fact~6 min
Three kinds of nothing~7 min
NULL propagates, it does not fail~8 min
COUNT counts rows, not things~8 min
A WHERE clause demotes your LEFT JOIN~8 min
Lies At Query Time · Review~5 min

Streams, offsets, and consumption~9 min
The event arrived before the row~8 min
Your MERGE never sees the delete~9 min
Idempotency is a key, not a hope~8 min
A filter is not a deletion~8 min
The Rows That Never Arrived · Review~5 min

Upstream renamed it, nothing failed~9 min
The schema held, the vocabulary moved~8 min
Types do not survive the layer boundary~8 min
Position binds the column, not the name~9 min
Contracts Nobody Wrote · Review~5 min

A parse failure looks like no data~8 min
The same string, two different dates~8 min
Today's mapping rewrites last year's facts~8 min
The run that outgrew its interval~8 min
Time Is Hostile · Review~5 min

Lag propagates through tables, not views~10 min
Every refresh bills, even the empty ones~8 min
You busted the wrong cache~8 min
One character swallows every failure~8 min
Refresh, Cache, And The Bill · Review~5 min

Count parity as an alarm~10 min
Your diff and your database sort differently~8 min
The label is part of the number~8 min
A template bug is a data leak~8 min
Proving The Number, And Who May See It · Review~5 min

Course

Green Pipelines, Wrong Numbers

The pipeline succeeded. The number is wrong. Nothing knows.

Start free: Success is a claim, not a fact