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查询主体中的from… let… where片段可选的from… let… where部分是查询主体的第一部分，可以由任意数量的3个子句来组合–from子句、let子句和where子句。
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【原创】SDK与 IDE等名词解释
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SDK：全称 Software Development Kit ,软件开发工具包。IDE：全称 Integrated Development，集成开发环境。SDK是一个能够进行开发的环境，是一个基本的环境，可以添加一些其他的功能，添加插件帮助实现想要的功能。这种将想要的插件安装在SDK上的环境称为IDE
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【原创】BigDecimal判断两值是否相等
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1、用compareTo方法,用compareTo方法来判断BigDecimal两值是否相等，判断结果为0则相等，否则不等，如下：if(amt == null|| amt.compareTo(BigDecimal.ZERO)==0){}
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SDK：1、子报表向主报表传参，在Return Values配置;2、主报表向子报表传参，在Parameters中配置;3、Data Source Expression中配置主报表向子报表传要显示的数据源，subData为数据集名称
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【原创】删除 List 元素的几种方法
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删除 List 中的元素会产生两个问题： 1、删除元素后 List 的元素数量会发生变化； 2、对 List 进行删除操作可能会产生并发问题；
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