hierarchy

问题 When you ask for a new HierarchyID between two others, the result gets progressively longer. For example, between 2/5.6 and 2/5.7 there's only 2/5.6.1 and other 4 component paths. The HierarchyID data type is limited to 800 some bytes, so you can't repeat this forever. Then again, integer types are also limited, but it isn't a problem in practice. Should I periodically defragment my table so that height doesn't grow unbounded? 回答1: It's considered a "best practice" with the hierarchyid to

问题 I'm confused in python class hierarchy. I want to know the relation between type and object. object is the top of 'issubclass()' function. type is the top of 'thing. class ' and 'type(thing)'. (I intentionally didn't use the word object again to avoid confusion. instead I used thing.) Surprisingly isinstance(object, type) and isinstance(type, object) both return true. Explain the hierarchy in detail. Thanks I mean which one was written first? type? or object? 回答1: In Python, everything is an

问题 Failing to find a solution to this question I was wondering if there was a better way of storing data for this problem. That db structure allows items to be stored in multiple categories, but doesn't allow easy access to the parent category hierarchy. What I would like is to have a category relationship such as: Books > Novels > Paperbacks > Hardbacks And have an item stored against Paperbacks for instance that would also show up in Novels and Books. So the 'categories' actually work more

问题 I want to do a hierarchy menu with a reactive table output. I want my app to do things below: when I choose the brand = w , the model input I can choose should only be lower hierarchy of w (in this case: model should be w123 and w456 ), and the table output should be the subset of brand w when I choose the brand = w and model = w123 together, and table output should list the subset of brand = w & model = w123 here are my codes, could anyone help me? thanks ui： library(shiny) shinyUI(

问题 I have table in sql which have three columns (ID, Name, ParentID) and each columns have many records. Now what i want is to get all hiearachy from ParrentId, to include it in three view. Is that can be solved with some nice LINQ solution? What i try before is to use set of List-s which one of those is child, but problem occur cause some child list can also have more childs under. I need this with linq code: List<Menu> hList = new List<Menu>(); var m1 = new Menu(); var m2 = new Menu(); var m3

问题 I want to create hierarchical report in SSRS using this simple table? Could you please help me? I follow the tutorial here: https://www.mssqltips.com/sqlservertip/1939/working-with-a-parent-child-hierarchy-in-sql-server-reporting-services-ssrs/ but I can't figure out how the EmployeeKey and ParentEmployeeKey apply to my table. As far As my table concern Col2 Is the Employee and Col1 is the parent. But in SSRS when I group by Col2 and Recursive Parent is COL1 I don't get the desired result.

问题 I am working with Symfony2 and Twig: I have a table that is set up to handle hierarchical data with Doctrine. It is a list of categories with parent->children->sub_children->sub_sub_children etc... Many many variations. I am able to display them on the page like so, but the issue is there is no "indentation" to show which element belongs to what parent or child or child child etc etc. <table class="table" id="tableList"> <thead> <tr> <th>Category Name</th> </tr> </thead> <tbody> {% for

问题 I have a website with a referal system, and I want the users to be able to see what users they referred, using a treeview. My database table is set up so that when a user refers somebody with his referal code, the new users gets an ID, a sponsor code (the referal code from his "sponser" aka the person who got him into this site) and a referal code (his own referal code to get other people to join under him). I have no idea how i can get this info out of my MySQL database, and into a treeview

问题 I have a csv with two columns: employee id 'eid' and manager's employee id 'mid' . Trying to get python code that will, for each employee, add columns showing employee id's of the manager all the way to CEO. CEO has a an employee id of 1. Ultimately I want to write the result back to a csv. So the data looks like: eid, mid 111, 112 113, 112 112, 114 114, 115 115, 1 I am expecting output that looks like this. Note that while no employee will have more than 4 levels of managers, but i would

问题 Looking for SQL Server CTE example to create hierarchy in such a way that I can output all the series like flattening the each hierarchy. e.g in family tree if root start from grand Parent I need list of each family memeber's hierarchy list with member details + parent's row details like child1 row child1 +Parent row child1 + Grand parent Row child2 Row child2 + parent row child2 + grand parent's row and so on CREATE TABLE Family(id int NULL, Name varchar(20) null, Parent_id int NULL, level