Nested Report_FR

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设置好下面的关系(Mar 18做,copy from MyQ): 1) Customer.Orders.Items 的 MasterSouce.MasterField2) 后面2个的 DataSource分别指向前面1个表的MasterSource3) MasterField,其实都不需要界面的,只是为了更清楚那数据集之间的关系.也不费什么时间,及其FR中引入的是是frxDBDataset的username, (Customer <--------CustNo--------------…

Nested Loops join时显示no join predicate原因分析以及解决办法

本文出处:http://www.cnblogs.com/wy123/p/6238844.html 最近遇到一个存储过程在某些特殊的情况下,效率极其低效, 至于底下到什么程度我现在都没有一个确切的数据,因为预期很快就可以查询出来结果的SQL,实则半个小时都出不来,后面会有截图观察执行计划的时候发现中间有一步中出现一个类似如下非常规的连接提示警告,如下图 no join predicate 意思就是没有连接谓词,表之间join的时候没有指定连接谓词可以导致no join predicate, 但是…

Error on line -1 of document : Premature end of file. Nested exception: Premature end of file.

启动tomcat, 出现, ( 之前都是好好的... ) [lk ] ERROR [08-12 15:10:02] [main] org.springframework.web.context.ContextLoader.initWebApplicationContext(215) | Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean…

SQL Tuning 基础概述06 - 表的关联方式：Nested Loops Join，Merge Sort Join & Hash Join

nested loops join(嵌套循环) 驱动表返回几条结果集,被驱动表访问多少次,有驱动顺序,无须排序,无任何限制. 驱动表限制条件有索引,被驱动表连接条件有索引. hints:use_nl() merge sort join(排序合并) 驱动表和被驱动表都是最多访问1次,无驱动顺序,需要排序(SORT_AREA_SIZE),连接条件是<>或like导致无法使用. 在连接条件上建立索引可以消除一张表的排序. hints:use_merge() hash join(哈希连接) …

[LeetCode] Nested List Weight Sum II 嵌套链表权重和之二

Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list -- whose elements may also be integers or other lists. Different from the previous question where weight…

[LeetCode] Flatten Nested List Iterator 压平嵌套链表迭代器

Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be integers or other lists. Example 1: Given the list [[1,1],2,[1,1]], By calling next repeatedly until hasN…

[LeetCode] Nested List Weight Sum 嵌套链表权重和

Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list -- whose elements may also be integers or other lists. Example 1: Given the list [[1,1],2,[1,1]], return…