SQL Advent Calendar
Write a holiday-themed SQL query each December day to unlock the next challenge
The SQL Advent Calendar is a free December event from the SQL interview practice site Interview Master. From 1 December a new holiday-themed SQL question unlocks every day at 9 AM ET, 24 in total, each with sample tables to query.
Free · Login needed · Browser · Intermediate
About SQL Advent Calendar
Questions ask for things like the average day-over-day weight gain of polar bear cubs, so it trains aggregation and window-function style queries for analysts and engineers. Hints and an AI helper are available, and you can retry a question as often as you like.
It runs in the browser and you sign up to take part. Finishing all 24 before 31 December earns a certificate of completion.
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