How do I handle NULL values in SQL?
An example of an AI chatbot conversation about handling NULL values in SQL.
How do I handle NULL values in SQL?
In SQL, you can handle NULL values using functions like COALESCE, ISNULL, or by using conditional statements.
Can you give me an example of using COALESCE?
Sure! The COALESCE function returns the first non-null value in a list. For example: SELECT COALESCE(column_name, 'default_value') FROM table_name.
What happens if I try to perform arithmetic operations on NULL?
If you perform arithmetic operations on NULL, the result will also be NULL. For example, NULL + 5 will return NULL.
How can I filter out NULL values in a query?
You can filter out NULL values using the WHERE clause. For example: SELECT * FROM table_name WHERE column_name IS NOT NULL.
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