Interview prep
Land the role.
SelectFromData builds the skill. This is where you prove it in the room. The engagements you deliver here map directly onto what data-analyst, engineer, and architect interviews actually test — clarifying a vague ask, writing SQL under questioning, reasoning about a model, and explaining it to someone non-technical.
Practise live
Question bank
Every question · tap to reveal what a strong answer covers.
Best practices
The STAR method
Structure every behavioral answer as Situation → Task → Action → Result. It stops you rambling and guarantees you land the outcome. Spend most of your words on Action and Result.
Talking about a project
Lead with the business problem and your specific role, not the tech stack. Name one concrete decision you made and why. Close with measurable impact — a number beats an adjective.
Handling "I don’t know"
Say it honestly, then reason out loud toward how you’d find out. Relate it to something adjacent you do know. Bluffing costs you more than the gap — composure is the signal they want.
Whiteboard SQL tips
Restate the question and assumptions first. Talk through the row set before you write — filter, group, then aggregate. Name pitfalls (NULLs, fan-out, NOT IN) unprompted; it reads as real experience.