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Contents. Third sentence very unclear '.for instance, your entry in the database could point to several entries for each of the phone numbers that are yours' I can't understand what this is trying to say. First off, what does it mean 'your entry'. 08:08, 2 November 2012 (UTC) Prevalence of Crow's Foot Notation In 13 years doing database work in the United States, I've Foot notation everywhere.
This part needs a citation: 'Usage of Chen notation is more prevalent in the United States, while Crow's Foot notation is used primarily in the UK.' 18:58, 17 November 2010 (UTC) This part needs a citation: 'Usage of Chen notation is more prevalent in the United States, while Crow's Foot notation is used primarily in the UK and Australasia.' — Preceding comment added by (.
) 02:32, 15 July 2011 (UTC) Common Symbols Section Needs Work I must say that I agree at least on the lack of clarity of the first sentence. Either its meaning is wrong or it is poorly written. Whichever it is, the first sentence of the introduction is misleading to the least. 08:54, 8 June 2006 (UTC) I agree - calling an entity a ' discrete object is not very accurate, but then again, what would be a more accurate term?
10:20, 10 July 2006 (UTC) I'm not sure about a relationship having an attribute. How can this convert into a logical model?- 18:11, 4 March 2006 (UTC) You have a good point there - I think conversion from ER model to logical relational model must be treated if only to make the point that the ER model is not an informal drawing technique but has a sound formal basis. 10:20, 10 July 2006 (UTC) Another issue is the (universal) confusion between entities and entity sets, relationships and relationship sets. This article dutifully explains the 'correct' use of the terms, but before it does so has already used them 'incorrectly' (i.e. How everybody uses them in practice) quite a few times. So either the terms e. Set should be omitted or a more thorough clarification is in order.
12:17, 10 July 2006 (UTC) Symbols Any chance someone could mock up a set of images showing what these symbols are supposed to look like? Describing them is all well and good, but a picture can be worth a thousand words.:) Thanks, 03:45, 8 Apr 2005 (UTC) I've added a first example diagram. I'd like to include some more images but I'm having trouble deciding which examples would best clarify some of the text. Also, I'm wondering if it'd make any sense to upload the original Dia files and refer to them from the Image:erd-.png nodes for if anyone else wants to change something in the coloring or whatnot. 16:27, 12 Jun 2005 (UTC) Agreed. Just for fun: Can we get an ERD of the wiki that wikipedia et al.
Diagrams and ER 2004 As far as I know there are multiple ways of drawing ER diagrams. I use arrows. Yet the article implies that' Bold text' there's only this one way. Where's the explanation/links about ER 2004? - 12:53, 10 June 2006 (UTC) I have added a section entitled with a diagram and explanation for Crow's Feet notation.
I encourage you all to post up similar descriptions of the notations you prefer. See also section below. 13:05, 30 December 2006 (UTC) That's not the classical Crow's Foot notation, it's IDEF1X. 11:20, 6 November 2007 (UTC) I am nearly certain it should be 'Crow's Foot', not 'Crow's Feet'. 05:56, 12 November 2016 (UTC) Diagram is not standard This diagram is not remotely similar to the methods used by nearly all of the major ER tools in use today.
IDEF1X is far and away a more common mechanism, as are derivatives of that method that vary primarily in the symbols used to indicate n-ary relationships. I suggest we replace this article with one that is similar to the article referenced by the IDEF1X link (US Navy, I think). This article is absolutely useless for practitioners and students of ER models. 11:47 15 Oct 2006 PDT) I strongly disagree. Since the article's subject is the Entity-Relationship Model it should use the classical notation.
Any other choice would be somewhat arbitrary as there are many tools and many dialects and none of them is really predominant. Most (database) textbooks I know use the classical notation. 21:39, 15 October 2006 (UTC) I suppose we should use Roman Numerals for math articles since they are a more 'classical representation'. I have been involved with data modeling for nearly 20 years and have never seen an ER diagram like that. I agree that IDEF1X is generally considered the best representation. —The preceding comment was added by 19:54, 17 December 2006 (UTC).
What about the cardinalities of relationships? I thought these were annotated by numbers on the arcs of the relationships? 12:50, 18 October 2006 (UTC) Yes, that is correct.
21:29, 18 October 2006 (UTC) I have added a section entitled with a diagram and explanation for Crow's Feet notation. I encourage you all to post up similar descriptions of the notations you prefer.
I suspect we should replace the Artist-Song relationship with a Product-Recommendation relationship, because Artist-Song is really a many-to-many relationship if we are going to be true to the real world, and we need a one-to-many relationship to best illustrate the diagramming convention. My one concern is whether the editor who originally created the Artist-Song diagram can modify it to Product-Recommendation?
12:53, 19 December 2006 (UTC) If I have the support of other Wikipedians here, I'd be happy to refactor the section, putting the 'Crow's Feet' notation at the top until such time as we have a more appropriate notation available. Please let me know. 12:37, 19 December 2006 (UTC) Except it should be 'Crow's Foot', not 'Crow's Feet', right? 05:57, 12 November 2016 (UTC) The problem is that there are at least half-a-dozen different diagrammatic notations, which people call 'ERDs'.
Proponents of IDEF(1X), Crow's Foot, Chen-style, and at least two others that I can draw but can't name, will insist that their style is the 'one true ERD'. The Chen style (which.is. the original) is distinguished from the others by representing relationship types explicitly as 'first class objects' (nodes) rather than as lines (edges). AFAICT, every diagram in any of the other (non-Chen) styles of 'ERD' is isomorphic to a relational schema and, therefore, to a diagram in any of the other styles. In other words, any non-Chen 'ERD' can be converted to a non-Chen 'ERD' in one of the other styles by a simple relabeling and no 'mapping procedure' is needed to obtain a relational schema; they are, therefore, merely alternative representations of relational schemata. There is information loss in mapping from a Chen-style ERD to a relational schema (e.g.
Compound attributes are flattened), so it.is. different and, IMHO, operates at a somewhat higher level of abstraction. The assertion that the Chen-style diagram 'is not standard' is simply false: it may not be your favourite style (e.g. IDEF(1X)), but it is a perfectly standard Chen-style (i.e.
'original') ERD and these are used for pedagogic purposes in textbooks (c.f. Elmasri & Navathe) and university courses (at least two that I know of in two different countries) all over the world.
11:43, 6 November 2007 (UTC) No, the Chen style is NOT the original. Consultants at Scicon and CACI in the UK were using a kind of crow's foot notation in the early 1970s. But they didn't write academic papers about it, so it's hard to prove. ER modelling was invented by practitioners, not by Chen; Chen's contribution was to formalize the ideas and introduce them to an academic audience. 07:33, 8 April 2009 (UTC) THE EXAMPLE DIAGRAM IS WRONG!!!! I'm almost positive that the character should run into the creep instantiation and not the creep?
Could someone verify this? 23:02, 3 November 2006 (UTC) What in the world is 'creep instantiation'???
I've never heard of it and got no hits on Google when I searched for it. 13:08, 30 December 2006 (UTC) The example diagram is not wrong. My group and I designed this ER diagram and I photoshopped it up.
What we had in mind was that the creeps themselves would be molds for individual instantiations. For a simple example, think of. There's a bunch of 's running around, and they all look the same, but they're not the same one - they are all in different locations, and can be dealt with individually. The Goomba's in this example are Creep Instantiations, while the concept of a Goomba itself is a Creep. As to the term 'creep instantiation', of course it's not real, we made it up for the project. Matthew Tardiff 18:47, 30 December 2006 (UTC) I think the issue here is that is outside the for a number of us wikipedians here (and for a large number of visitors too). Finding a that is relatable for everyone is a high priority, do you have a preference from the ideas listed below, or perhaps another idea for a suitable:.
Customer, Sales Rep, Sales Order, Sales Order Item, Product. Borrower, Library, Section, Book, Book Category, Category, Loan, Loan Item.
Student, Degree, Degree Subject, Subject, Subject Instance, Course, Course Item, Lecturer, Lecturer Subject. Artist, Album, Album Song, Song, Composer. 13:09, 31 December 2006 (UTC) Super Mario Brothers was not the issue I was bringing up. I personally think the current diagram is a great example.
Everybody can relate to games. 18:23, 10 January 2007 (UTC) On the contrary Epachmo, it's mostly those in your demographic and culture who relate to these games. The people who read Wikipedia are very diverse. People who are likely to read this particular article would easily include, and, men and women from 18 to 65 years, many of whom would be unfamiliar with computer games. I'm thinking to proceed with the Sales from the paragraph above, which I suspect is the area that people from most cultures and backgrounds would be able to relate to. BTW, we can retain your diagram too. If you're game to reproduce the same diagram using a few different notations, it could become a very useful cross reference.
09:42, 11 January 2007 (UTC) PS. Sorry, I just realised I'd taken over your section and your original question isn't answered yet.
I've recently drawn up a few ERDs for, although clearly not as adequate as the Sales domain I'll try and get them up using several different notations for cross-reference. 12:38, 11 January 2008 (UTC) I totaly agree with that it would make better sense that a Character should run into and Instance of a creep and not the Creep's 'concept'.
12:38, 11 January 2008 (UTC) I think there was some misunderstanding here. A character would indeed run into an instance of a creep during the game - but that's not what this database is storing.
This database is storing each type of creep which the character has encountered. Matthew Tardiff ( 21:47, 20 August 2009 (UTC)) That makes more sense. I think the confusion comes from the phrase 'runs into'.
It would be better if instead it read, Character 'Has encountered this type of' Creep or something like that. 21:01, 22 September 2009 (UTC) Model -vs- Method I doubt that an Entity-relationship model can be called a data model. It is a method to design data models. 13:42, 18 Oct 2004 (UTC) If it were a method it would be called the Entity-Relationshp Method. The researchers at the ER 2004 would be highly amazed by your claim that the ER model is not a data model.
11:05, 19 Oct 2004 (UTC) Sorry for again starting a method discussion. The introduction sounds as if the ERModel is a data model for a data model - a meta model - which for me has an implicit methodological aspect. I think this was, what caused my discomfort. Wouldn't it be simplier (and still correct) to say 'A Entity-Relationship model is a high-level description of a conceptual data model. Entity-Relationship models include graphical notations for representing such data models in the form of entity-relationship diagrams'. 09:24, 1 Nov 2004 (UTC) It would be incomplete. As already explained, the ER model is a meta model (with a graphical notation and some semantics), so that is of course what the introduction should explain.
Why are you uncomfortable with that? I also fail to see why you connect that with a methodological aspect because that link is very very weak. There is no fixed method to arrive at your model and there is no fixed method to go from your ER diagram to your relational model, and, as was already explained, the scope of the ER model is much wider than just a method to arrive at your relational model. So what then is it exactly that you mean with this mysterious 'methodological aspect'? It's still as if you want to believe that the ER model is a method.
Please don't. Apart from being incorrect that view is much too narrow and does unjustice to the ER model.:-) - 13:53, 2 Nov 2004 (UTC) relation vs. Relationship I was consulting this entry in order to learn about how the terms relation vs. Relationship are used. Unfortunately, after reading the entry I was even more confused, because the 'Common symbols' section seems to use both words interchangeably: 'Relationships can be thought of as verbs.
Examples: an owns relation between a company and a computer.' Is this uncertainty inherent in those words? Or is there any consensus on how to distinguish these three levels:. an individual tuple (a row in a table). a set of tuples (a table filled with rows).
a type of sets of tuples (a table definition - what is actually drawn in a ER-diagram) 16:15, 21 January 2007 (UTC) You are correct. The section needs a fair bit of work. I've made the correction, but it still needs more work another day. To put it into common language, if your brother is a 'relation' (aka 'entity'), then you have a 'relationship' with him, keeping in mind that this is a rather rough analogy. A tuple is the correct term, and probably should be mentioned on the article somewhere, although I usually prefer the term row or record because it reaches a wider audience. Thanks, 12:47, 22 January 2007 (UTC) ER diagramming tools - Linkfarm The software currently listed is mostly shareware.
Can this list cleaned up?? Most of the software doesn't even draw real (E)ER!
They are.DATABASE. design tools, (E)ER is a particular modeling language. 14:22, 13 January 2007 (UTC) I agree, it would be good to separate the shareware -vs- commericial offerings in two separate subsections in. Do we have a volunteer to figure this out?
ThG, what precisely do you mean by 'not even drawing real ER'? ER is not a particular modelling language, there are many different notations for ER. Was there any specific products in the list that you are concerned don't belong? - 10:01, 14 January 2007 (UTC) Well, ER is a particular modelling language. Anyway, I should've been more specific: ER itself sux, the real modeling language is known as EER (Extended ER or Enhanced ER), which includes leak entities, unions, derivations, etc).
I'll go through the software list again and get back to you. 19:40, 18 January 2007 (UTC) I removed all the external links. It was becoming quite a linkfarm, violating.
02:50, 17 February 2007 (UTC) It's a shame because in particular was really good, and it's totally free and easily accessible from anywhere with an internet connection, unlike the others. You would however be technically right in that it is a relation schema designer and not an (E)ER diagram designer. 18:15, 18 February 2007 (UTC) Here's the external links that were deleted from. They look like real players in the market. Asking for volunteers to create a separate wikipedia pages for them so they can be relisted (refactored - content removed per WP:TALK):. All-in-one ER diagramming and ORM software.
a freeware database modeler that also creates SQL DDL code from its drawings. 13:52, 26 February 2007 (UTC) The 'ER diagramming tools' section is becoming a linkfarm, with the inappropriate external links.
The section may be large enough to become a separate article as well. For now, I'm removing the external links per.
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