terminology

what is index and can non-clustered index be non-unique?

百般思念 提交于 2019-12-01 00:14:43
问题 Subquestion to my question [1]: All definitions of (MS SQL Server) index (that I could find) are ambiguous and all explanations, based on it, narrate something using undefined or ambiguously defined terms. What is the definition of index? For ex., the most common definition of index from wiki (http://en.wikipedia.org/wiki/Index_(database) ) : 1) "A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of slower writes and

What is the difference between a subroutine and a function? [duplicate]

白昼怎懂夜的黑 提交于 2019-12-01 00:14:09
问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: What is the difference between a ‘function’ and a ‘procedure’? I searched online for an answer to this question, and the answer I got was that a function can return a value, modify a value, etc., but a subroutine cannot. But I am not satisfied with this explanation and it seems to me that the difference ought to be more than just a matter of terminology. So I am looking for a more conceptual answer to the

what is the difference between hash map, hash set, hash dictionary?

筅森魡賤 提交于 2019-12-01 00:07:23
Can somebody explain me the difference between the following structures: Hash Map Hash Table, Hash Set, and Hash Dictionary HashMap, HashTable, and HashDictionary all mean a dictionary, mapping unique unordered keys to corresponding values, implemented using hashcodes. HashSet means a unique, unordered set, implemented using hashcodes. 来源: https://stackoverflow.com/questions/4851811/what-is-the-difference-between-hash-map-hash-set-hash-dictionary

What is the difference btw “Order” and “Degree” in terms of Tree data structure

陌路散爱 提交于 2019-12-01 00:02:26
B-Tree Definition they use the 'order' term in : According to Knuth's definition, a B-tree of order m is a tree which satisfies the following properties: 1. Every node has at most m children. ... and 'Degree' is defined in Tree terms as: Degree – number of sub trees of a node. so, are they same thing? I cannot feel any difference. Degree represents the lower bound on the number of children a node in the B Tree can have (except for the root). i.e the minimum number of children possible. Whereas the Order represents the upper bound on the number of children. ie. the maximum number possible. B

Parse Time vs. Execution Time [closed]

最后都变了- 提交于 2019-11-30 20:56:46
问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago . I am trying to learn MS Batch, and I was specifically trying to understand the "setlocal" and the "enabledelayedexpression" aspects, when I came across vocabulary I did not understand: execution time and parse time 回答1: The parser has different phases, when parsing a single line. So the percent

What is a stack imbalance?

你说的曾经没有我的故事 提交于 2019-11-30 20:24:39
问题 Having read this article F# Versus Mathematics: Part One - Getting Started with BLAS and LAPACK I stumbled across the term stack imbalance in the paragraph A Warning, Perhaps an Omen . I googled and searched on SO, but could only find people struggling with stack imbalances and no generall explanations. Bonus Question: Does it only affect f# or is it a general problem in C, C++, Python, Java, etc.? p.s. please change the tags of the question if necessary 回答1: A stack imbalance occurs when the

What is Method, Property and Function?

拜拜、爱过 提交于 2019-11-30 20:18:58
Yeah, I'm struggling with that. I cannot distinguish among them because every explanation I read is so unclear and philosophical enough. Can someone clear up these definitions for me ? Thanks guys. These definitions apply as much to procedural-programming as oop ? Thanks. Function is a combination of instructions coupled together to achieve some result. It may take arguments and return result. If a function doesn't return a result it is usually called a procedure. Examples: function drawLine(x1, y1, x2, y2): // draws a line using Bresenham's algorithm from x1,y1 to x2,y2. // doesn't return

What does “vendoring” mean in Go?

不问归期 提交于 2019-11-30 17:37:25
When learning about Go's dependency management, I often hear the term "vendor" used as a verb. Example: "The dependencies that your application vendors..." What does it mean to vendor a dependency in this context? Examples: "Dependencies that are vendored with your application" Source: https://devcenter.heroku.com/articles/getting-started-with-go#declare-app-dependencies "godep will write the vendored code" Source: https://github.com/tools/godep#go-15-vendor-experiment Follow-up questions: Is this related to vendoring in Ruby ? Is this term fully defined in the Go 1.5 Vendor Experiment , or is

Java, terminology clarification

左心房为你撑大大i 提交于 2019-11-30 16:32:04
In Java, an Object can have a runtime type (which is what it was created as) and a casted type (the type you have casted it to be). I'm wondering what are the proper name for these types. For instance class A { } class B extends A { } A a = new B(); a was created as a B however it was declared as an A . What is the proper way of referring to the type of a using each perspective? Jon Skeet I think it's important to distinguish between the object (which exists at execution time, and just has its execution time type) and an expression (such as a variable) which has a compile-time type. So in this

Does statemachine and statechart mean the same?

☆樱花仙子☆ 提交于 2019-11-30 14:52:38
问题 I have heard people using these terms. I wonder if they refer to the same thing or is there a difference between these two? 回答1: Wikipedia actually covers this pretty well. http://en.wikipedia.org/wiki/State_diagram State machines have been around for a long time (decades at least). They consist of states (usually circles) and arrows between the states where certain actions can trigger an transition along an arrow. Moore and Mealy machines are the two main variants, which indicate whether the