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6.2.1.3 Base Field Types
— Operation on base-table: supported-type? symbol

Returns #t if symbol names a type allowed as a column value by the implementation, and #f otherwise. At a minimum, an implementation must support the types integer, ordinal, symbol, string, and boolean.

— Operation on base-table: supported-key-type? symbol

Returns #t if symbol names a type allowed as a key value by the implementation, and #f otherwise. At a minimum, an implementation must support the types ordinal, and symbol.

An ordinal is an exact positive integer. The other types are standard Scheme.