- Common C# Programming Mistake #2: Misunderstanding default values for uninitialized variables. In C#, value types can’t be null. By definition, value types have a value, and even uninitialized variables of value types must have a value. This is called the default value for that type.
- A value for an identity column is generated during an INSERT, UPSERT, or UPDATE statement. An identity column can be defined either as GENERATED ALWAYS or GENERATED BY DEFAULT. GENERATED ALWAYS The system always generates a value for the identity column. An exception is raised if the user supplies a value for the identity column.
- The column named COLOR in the table named PRODUCTS will not be returned in subsequent reads of the table by Oracle, as it has been deleted logically. (*) The column named COLOR in the table named PRODUCTS will be assigned default values. The column named COLOR in the table named PRODUCTS will be created.
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