Firebird and the Standards - Firebird

Conformance with the standard is a matter of degree, rather than an absolute. Vendors may freely implement language features that the standard does not prescribe. Conformance is about the ways that features recognized and described by the standards are implemented, if they are present. Conformance varies inversely with the number of standard features that are implemented in an idiosyncratic fashion.

Firebird’s SQL language adheres closely to the SQL-92 standards (ISO/IEC 9075:1992) at entry level. Firebird 1.5 introduced a number of features in accordance with the more recently released SQL-99 standard. Although Firebird SQL follows standards closely, there are small differences.

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