Metastrings
Metastrings are special SQL expressions. The metastrings, also called meta-SQL, are preceded with a percent (%) symbol, and can be included directly in string literals. They expand at runtime into an appropriate substring for the current database platform. Metastrings are used in or with:
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SQLExec.
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Scroll buffer functions (ScrollSelect and its relatives).
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PeopleSoft Application Designer to construct dynamic views.
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Some rowset object methods (Select, SelectNew, Fill, and so on).
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SQL objects.
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Application Engine.
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Some record class methods (Insert, Update, and so on).
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COBOL.