Coach note
Interviewers ask this kind of question to surface how you think, not what you remember. The strongest answers are specific, calmly told, and end on what changed.
SQL · Query planning
A query that aggregates a billion-row events table by day runs in 40 seconds. The customer is unhappy. Walk me through how you'd investigate.
Type your answer
0of ~220 wordsAbout a minute spoken
Voice isn’t supported in this browser — type your answer in the box.
Create a free account to get more critiques.
Your answer appears here as you speak.