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?
You can handle NULL values in SQL 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 about filtering 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;.
Are there any performance considerations when dealing with NULLs?
Yes, using NULLs can affect performance, especially in indexes. It's often better to avoid NULLs if possible.
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