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CREATE FUNCTION Calculator ( @Opd1 bigint, @Opd2 bigint, @Oprt char(1) = '*' ) RETURNS bigint AS BEGIN DECLARE @Result bigint SET @Result = CASE @Oprt WHEN '+' THEN @Opd1 + @Opd2 WHEN '-' THEN @Opd1 - @Opd2 WHEN '*' THEN @Opd1 * @Opd2 WHEN '/' THEN CASE WHEN @Opd2 = 0 THEN NULL ELSE @Opd1 / @Opd2 END ELSE NULL END RETURN @Result END;

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