目录背景1、建立测试环境2、构建查询语句3、建降序索引总结参考文章背景 索引是关系型数据库中优化查询性能的重要手段之一。对于需要处理大量数据的场景，合理的索引策略能够显著减少查询时间。
I\'m looking for a code coverage tool that I can use with a BlackBerry application. I\'m using J2ME-Unit for Unit Testing and I want to see how much of my code is being covered by my tests.
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