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Creating User-Defined Routines
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Extending Data Types
In This Chapter
Creating an Opaque Data Type
Designing an Opaque Data Type
Determining External Representation
Determining Internal Representation
Writing Opaque-Type Support Functions
Support Functions as Casts
Stream Support Functions
Disk-Storage Support Functions
Handling Locale-Specific Opaque-Type Data (GLS)
Registering an Opaque Data Type
Registering an Opaque Type in a Database
Registering Opaque-Type Support Functions
Registering the Opaque-Type Casts
Providing Statistics Data for a Column
Collecting Statistics Data
Designing the User-Defined Statistics
Defining the Statistics-Collection Function
Collecting the Statistics
Registering the statcollect( ) Function
Executing the UPDATE STATISTICS Statement
Using User-Defined Statistics
Displaying Statistics Data
Using User-Defined Statistics in a Query
Optimizing Queries
Query Plans
Selectivity Functions
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