The constraint that exposed a gap in my toolkit: a SQL challenge, zero internet allowed. Here's how I turned that gap into a permanent resource — with Claude. While interviewing recently, I hit a SQL ...

SQL has a clear edge, and past that edge it stops being the right tool. Complex modeling, the messy iterative experimentation of trying a dozen approaches before one works, custom algorithms, rich ...

Learn how to use Excel's new GROUPBY and PIVOTBY functions through five real-world examples, ranging from easy to hard. This ...

Excel formulas are getting scary good.

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