Should I Use Null or Empty String?

An empty string is useful when the data comes from multiple resources. NULL is used when some fields are optional, and the data is unknown.

Is empty string and null same in SQL?

NULL is used in SQL to indicate that a value doesn't exist in the database. It's not to be confused with an empty string or a zero value. While NULL indicates the absence of a value, the empty string and zero both represent actual values.

Is null the same as empty?

The main difference between null and empty is that the null is used to refer to nothing while empty is used to refer to a unique string with zero length.