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What Is A Default Value
A default value is a preset value defined for a column type or a variable. Default values are used when many records or instances hold similar data. Default values can vary depending on the type of data, such as char, enum, struct, or any nullable value type.
In programming languages, a default value is the value used when no value is provided for an Insert or an Update statement.
In C#, a default value is whatever you get when you call default (TypeName). For ReferenceTypes, this is invariably null. For ValueTypes, this is typically 0 (for numeric types) or an instance of the struct after its default constructor is called.
The default value expression produces the default value of a type. There are two kinds of default value expressions: the default operator call and a default literal. You also use the default keyword as the default case label within a switch statement.
In summary, a default value is a preset value defined for a column type or a variable that is used when many records or instances hold similar data. It can vary depending on the type of data and programming language used.
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