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By understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)

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In addition to an internal structure, SQL's structured types can be associated with specific user-defined functions that are used for all comparisons of instances of the type, for casting values of the type to and from other types, and for implementing all sorts of behaviors (that is, semantics) of the type. 1 contains the syntax of the CREATE TYPE statement. Please don't be too intimidated by the m a n y different parts of this statement. I'll get to t h e m all in due time. My purpose in giving you the entire syntax now is so that I can refer back to it as I get to each c o m p o n e n t in the discussion of structured types throughout the rest of this chapter.

Every row of a typed table is an instance (or a value, if you wish) of the UDT of which the table is a type. The table has one column derived from each attribute of the UDT (that is, the data type of the column is the data type of the associated attribute, the name of the column is the name of the attribute, and the values stored in the rows of the column are the values of the instances of the attribute in the instances of the type); it also has one additional column, called a self-referencing column.

Based on this belief, it is possible that future generations of the SQL standard may first deprecate and then delete domains entirely, in spite of the existence of users who take advantage of domains' macro-like behaviors. 2 29 Structured UDTs as Values As indicated earlier, the other sort of user-defined type supported in SQL:1999 is the structured type; you should infer from its name that values of such types are permitted to h a v e - - a n d usually do have--internal structure to them. For example, a structured type n a m e d address might contain several components: number, street_name, apartment_number, city, state_or_region, country, and postal_code.

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advanced sql 1999 by understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)


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