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Questions tagged [datamodel]

According to Hoberman (2009), "A data model is a wayfinding tool for both business and IT professionals, which uses a set of symbols and text to precisely explain a subset of real information to improve communication within the organization and thereby lead to a more flexible and stable application environment.

In software engineering, the term data model is used in two related senses. In the sense covered by this article, it is a description of the objects represented by a computer system together with their properties and relationships; these are typically "real world" objects such as products, suppliers, customers, and orders. In the second sense, covered by the article database model, it means a collection of concepts and rules used in defining data models: for example the relational model uses relations and tuples, while the network model uses records, sets, and fields.

References:

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Mahout - FileDataModel: Delete file(s) after refresh?

I use the FileDataModel as the DataModel for Recommendations in Mahout. I first generate the base file (e.g. prefs.txt). From time to time, there are some changes, which are written to update files (prefs.1.txt, prefs.2.txt, ...). Am I allowed to…
nico.ruti
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Crash When Saving On Device After Changing Datamodel

I've been hunting for a solution for the last four hours and I am posting in desperation. My app was working perfectly on the simulator, my iPhone, and my ipad until I added an attribute to one of my Data Models. My iPhone application uses Core Data…
Blamdarot
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Pros and Cons of massive table that controls all data flow with stored procs

DBA (with only 2 years of google for training) has created a massive data management table (108 columns and growing) containing all neccessary attribute for any data flow in the system. Well call this table BFT for short. Of these columns: 10 are…
gbegley
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C# Data Model that will allow deserialization of array with no names

I'm trying to deserialize a response from an API. [ { "field1": "value a", "field2": "value b" }, { "field1": "value c", "field2": "value d`" } ] And I'm getting an error... Newtonsoft.Json.JsonSerializationException:…
SteveTinkers
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Relation Between Two Fact Tables In Data Warehouse

In My database I have invoice and project some of invoice are related to project some of them are not, It means some Invoice will be created base on project details and milestone some of them are on independent so fore creating a Date warehouse is…
sanaz amini
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Looking for feedback on Data Model

I'm taking a Coursera course called Advanced Data Modeling and practiced creating a conceptual model as well as a logical ER diagram. The prompt gave me the following fields and said to create a data model using them: Order ID Client name Client…
Jason Minhas
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How do I "link" two tables when the primary key of table_a could exist in none, one or many columns in table_b?

How do I link two tables, People and Messages, when there is no single column in the Messages table that corresponds to the primary key of the People table? I have two tables: one containing email messages called Messages and one of people called…
hkh
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How to decide whether to store data under 1 column or multiple columns?

I am recording the data for 3 counters and have the choice of using either of following schema: Date|Sensor|Value Date|Sensor1Value|Sensor2Value|Sensor3Value When visualizing using either of the above schemas, x-axis will be the date. In case of 1st…
variable
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Best way to compare 2 Data models in C# .NET Core

I have 2 data models with same properties which I gets data from 2 web API responses. I am trying to compare 2 models with values, If data difference is found, I need to compare ,find differences if found assign to a new instance of data model or…
PavanKumar GVVS
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Similar properties in a typescript model class

I like to have data model class, which should hold same information for two persons at same time.. E.g. export class persons { constructor( public person1Name:string = '', public person1Age:number = 0, public…
Mr. Learner
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Creating Relationship in PowerBI

I have to create a relationship, where both table have dates and measures. I created name bridge between two tables. if i pull by name it works, however, not with date, i am not able to create the relationship. Can you please help to create relation…
Learn
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Swift ios make a generic input type with multiple type

I would like to defined a variable with multiple type, but i fail in this case. I want to use it as UITextfield or UIButton in other way. Please help struct FieldsModel { let input: [UITextField, UIButton] }
wong john
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How to connect DimDate table to fact and dimensional tables

I have fact table,Dim project , Dim student & Dim date tables in the power BI model. Fact contains studentid,projectid,is submitted, submitted date ,marks Dim student contains studentid,joining date, name Dim project contains projectid, project…
Michell
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Firestore contacts list data model

I am working on a management app for local groups. The app also displays each group its contacts list. I wonder how should I design my database? If I store all users on a root level collection, each time a user opens the contacts list it will read…
ASF
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MySql-Workbench - Is it possible to have 2 different unrelated diagrams within a single model?

I am creating a data model and want to create two independent diagrams, one diagram should show tables from Schema A and another diagram should show tables from Schema B. I tried doing it in same model but i see both the schemas in both the diagrams…
user10916892
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