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The question of whether to represent Boolean true as -1, especially when dealing with PostgreSQL and MS Access, raises important considerations for database design and interoperability. PostgreSQL inherently treats Boolean true as 1, aligning with the conventional binary logic used in most modern systems. In contrast, MS Access uses -1 to denote true, a legacy from its origins in Visual Basic environments where all bits set to 1 (in two’s complement form) represent true, hence the -1 integer value. This fundamental difference can significantly impact data integrity and cross-platform compatibility.

Using -1 to represent true within PostgreSQL could introduce confusion or errors, as many functions and operators expect 1 to be the canonical true value. For instance, aggregate functions, conditional queries, or application-layer logic that rely on Boolean evaluation might behave unpredictably if the Boolean convention is not consistently applied. Similarly, when data migrates between MS Access and PostgreSQL, failing to properly translate Boolean values could lead to logical inconsistencies, incorrect filtering, or erroneous calculations.

Moreover, this discrepancy underscores the importance of establishing clear data handling standards when integrating systems—whether it’s through mapping layers, data validation, or strict schema definitions. Adopting best practices, such as using native Boolean types and converting values appropriately during data interchange, helps safeguard against misinterpretation.

Ultimately, while the representation of true as -1 may be a legacy quirk specific to MS Access, it is vital for database professionals to recognize and address these differences proactively. Doing so ensures reliable data retrieval, consistent logic execution, and the overall integrity of complex, multi-platform database environments.