What is the difference between NULL and an empty string in SQL?
An example of an AI chatbot conversation about SQL NULL vs empty string differences.
What is the difference between NULL and an empty string in SQL?
In SQL, NULL represents a lack of value, while an empty string is a string with zero characters. They are not the same.
Can you give me an example of how they behave in a query?
Sure! If you query a column with NULL, it won't return that row unless you specifically check for NULL. An empty string will return the row.
How do I check for NULL values in SQL?
You can use the IS NULL condition in your SQL query. For example: SELECT * FROM table WHERE column IS NULL;
What about checking for empty strings?
To check for empty strings, you can use: SELECT * FROM table WHERE column = ''; This will return rows where the column is an empty string.
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