Explain a SQL query result

Q: How do I practice SQL interview questions?

PracHub provides an interactive SQL console where you can write and test queries against real database schemas. Get instant feedback and compare your solution with the expected output.

Q: What difficulty level is this coding question?

This is a medium difficulty Data Manipulation (SQL/Python) question, commonly asked during Technical Screen rounds at TikTok.

Q: What role is this question designed for?

This question is commonly asked for Data Engineer candidates at TikTok during technical interviews.

Question

Given two tables and a specific SQL query, precisely explain the expected result set: which rows are returned, what each column contains, how joins/filters/aggregations/window functions affect the output, how NULLs and duplicates are handled, and the final ordering. State any assumptions and edge cases.

PracHub · Accepted Answer

This question evaluates proficiency in SQL result-set interpretation and reasoning about joins, filters, aggregations, window functions, NULL handling, duplicate rows, and ordering within the Data Manipulation (SQL/Python) domain for a Data Engineer role.

Quick Overview

Explain a SQL query result