Web Reference: Apr 11, 2011 · NULL is a non value, like undefined. '' is a empty string with 0 characters. The value of a string in database depends of your value in your UI, but generally, it's an empty string '' if you specify the parameter in your query or stored procedure. Jan 4, 2011 · NULL means absence of value (i.e. there is no value), while empty string means there is a string value of zero length. For example, say you have a table to store a person' data and it contains a Gender column. Dec 19, 2024 · Empty strings are specific to string columns and cannot be applied to different data types. For example, consider a table with product information, where one column stores warranty details. A NULL value in this column indicates that the warranty period was not specified.
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