Implementors should be aware that this specification is not stable.
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The complexity and size of the SQL standard means that most Implementors do not support the entire standard.
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To allow Implementors to provide their own types,
all conforming applications are required to avoid symbols ending in"_t", which permits the implementor to provide additional types.
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There are several reasons for this lack of portability between database systems:
The complexity and size of the SQL standard means that most Implementors do not support the entire standard.
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Implementors often use the facade design pattern
when a system is very complex or difficult to understand because the system has a large number of interdependent classes or because its source code is unavailable.