Join choice affects whether unmatched records appear in your result set, which is a common issue in reporting and QA work on platforms like TELUS Digital support and conversation datasets.
Explain the difference between an INNER JOIN and a LEFT JOIN in SQL. You should describe what rows each join returns, how unmatched rows are handled, and why NULL values appear in some join results.
Use a simple scenario such as joining td_conversations to td_agents, or td_customers to td_orders, and explain when you would use each join type.
Keep your answer at an interview-ready level: define both joins clearly, compare the output behavior, and give one practical use case for each. You do not need to cover every join type, but you should be precise about result sets and NULL handling.
Join choice affects whether unmatched records appear in your result set, which is a common issue in reporting and QA work on platforms like TELUS Digital support and conversation datasets.
Explain the difference between an INNER JOIN and a LEFT JOIN in SQL. You should describe what rows each join returns, how unmatched rows are handled, and why NULL values appear in some join results.
Use a simple scenario such as joining td_conversations to td_agents, or td_customers to td_orders, and explain when you would use each join type.
Keep your answer at an interview-ready level: define both joins clearly, compare the output behavior, and give one practical use case for each. You do not need to cover every join type, but you should be precise about result sets and NULL handling.
