We might earn a commission if you make a purchase through one of the links. The McClatchy Commerce Content team, which is independent from our newsroom, oversees this content. This article has ...

Put your thinking cap on, because it's time to find out how much you know about history, geography, math, science, food, animals, entertainment and pop culture with this roundup of easy trivia ...

Window functions are the single most frequently tested SQL topic in data science and analytics interviews at large technology companies. Window functions are a common SQL interview topic because they ...

Day-7 retention queries are difficult because candidates must define the metric precisely, preserve the cohort denominator, and implement date logic without dropping inactive users. Cohort analysis ...

If you've ever wanted to get to know someone a bit better but didn't know how to go about it, please allow us to introduce you to the 21 questions game. The word "game" is used very loosely here, ...

Curious engineer writing about things that work, fail, and unexpectedly scale. SQL practice is boring because nothing feels real. You type SELECT * FROM users, get a green checkmark, move on. The data ...

SQL Case Files is a free interactive SQL game that teaches SQL through crime-solving challenges. Learn SQL online with hands-on puzzles, realistic datasets, SQL practice exercises, and a full ...

Learning SQL is a great move for anyone working with data, but actually getting good at it can feel tricky, especially if you don’t have a database handy. Luckily, there are tons of free places online ...

Getting good at SQL for interviews can feel like a puzzle. You know the basics, but putting them together in a way that impresses people is another thing entirely. Luckily, there are great tools out ...