SQL server IS NULL AND = NULL Interview Question
SQL server IS NULL AND = NULL Interview Question
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When gearing up for SQL Server interviews, expect questions about NULL handling, vital for data integrity and accurate query results. Topics include the distinction between IS NULL and IS NOT NULL in queries, using COALESCE and ISNULL to replace NULL values, the impact of NULL on JOIN operations, understanding NULL in aggregate functions, and handling NULL in subqueries and indexes. Mastery in these areas highlights your capability to manage incomplete data and fine-tune SQL queries effectively. Happy studying!
Top three NULL handling interview questions you might face:
1. How do you manage NULL values in SQL Server?
This question assesses your grasp of functions like COALESCE and ISNULL, and your methods for handling NULL values in queries.
2. What distinguishes IS NULL from IS NOT NULL in SQL Server?
This question gauges your ability to filter datasets based on the presence or absence of NULL values.
3. How do NULL values affect JOIN operations in SQL Server?
This question checks your understanding of how NULLs can alter the outcomes of INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN operations.
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