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- https://www.petitmonte.com/bbs/answers?question_id=8319(9)
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- https://www.google.com/url?q=http://firebirdwiki.jp/webroot/?ALTER%20TABLE&sa=U&ved=2ahUKEwiFv7LWi_qDAxWSsFYBHQhDCZM4HhAWegQIAhAB&usg=AOvVaw1hA45WEVmdXFBVwaqKEhPx(1)