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Firebird数据库上的Haversine公式

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I used the following sql for mySQL but I now need to use this for a Firebird database. I have searched and read the Firebird documentation but can't seem to locate an alternative. In Firebird 'radians' and 'limit' both are not supported. Has anyone successfully done similar in Firebird?I used the following sql for mySQL but I now ne




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