How do I handle NULL values in SQL?
An example of an AI chatbot conversation about SQL NULL handling techniques.
How do I handle NULL values in SQL?
Handling NULL values in SQL can be done using functions like COALESCE, ISNULL, and NULLIF. Would you like examples?
Yes, please provide examples of using COALESCE and ISNULL.
Sure! COALESCE returns the first non-null value in a list. For example: SELECT COALESCE(column1, 'default') FROM table;. ISNULL checks if a value is NULL and can replace it: SELECT ISNULL(column1, 'default') FROM table;.
What about NULLIF? How does it work?
NULLIF compares two expressions and returns NULL if they are equal. For example: SELECT NULLIF(column1, column2) FROM table; will return NULL if column1 equals column2.
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