【摘要】 排名运算按次序为数据库查询结果集中的每行分配一个排名值,针对RDBMS上无法直接支持排名运算的状况,提出了多种解决方案,通过在基准测试下分析各方案的性能差异,给出不同情况下的最佳方案。更多还原

【Abstract】 Ranking operation set a ranking value of each row of database query results by sorting.RDBMS is not for the direct support of the ranking operations,introduce some solution of ranking operation,According to the analysis of the performance by a benchmark tests,given the best option under different circumstances.更多还原