NULL in SQL is a critical concept representing missing or unknown values, requiring careful handling to maintain data integrity in queries.
The IS NULL and IS NOT NULL operators are essential in SQL for checking NULL values correctly; incorrect usage can lead to unexpected query results.
Understanding functions like ISNULL() and COALESCE() is vital for managing NULL values effectively, enabling developers to provide default values for unknown data.
When aggregating data, it's important to consider how NULL values can affect the outcome, such as leading to incorrect averages or totals.
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