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Today's tutorial focuses on cross apply and outer apply, explaining how they differ from regular joins and their importance in queries. The example demonstrates a simple left join to retrieve names and phone numbers from two tables. Using a left join ensures that all customer names are returned, even if they don't have a corresponding phone number. This is illustrated by the case of Michael Raheem, who doesn't have a record in the phone table. Overall, the tutorial sets the stage for understanding the functionality and necessity of apply in SQL queries.
