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Простенький каст, но "то ли лыжи не еду, то ли..."

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CREATE DOMAIN AAID AS CHAR(2) CHARACTER SET ASCII CHECK(VALUE SIMILAR TO '[A-F]{2}');

SELECT Cast(Cast('BP' AS CHAR(2) CHARACTER SET ASCII) AS AAID) FROM RDB$DATABASE;

Запрос плюётся ошибкой валидации! ЧЯДНТ?

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