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Creating User-Defined Casts
In This Chapter
Understanding Casts
Built-In Casts
User-Defined Casts
Opaque Data Types
Distinct Data Types
Named Row Types
Casts That You Cannot Create
Creating a User-Defined Cast
Choosing the Kind of User-Defined Cast
Implicit Cast
Explicit Cast
Choosing the Cast Mechanism
Straight Cast
Cast Function
Example of a Cast Function
Defining the Direction of the Cast
Dropping a Cast
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