Top "Relation" questions

Graphviz Dot, mix directed and undirected

For my application I need to represent simultaneously (on the same graph) two relations: one is simmetric, the other is …

graph graphviz relation symmetry

applying a default scope with reference to a relation in yii

I can't find too much documentation on applying a default scope to a model in yii, I was wondering if …

yii relation scopes default-scope

Yii2 "has no relation named" at search model even the function it is defined in the main model

I am having a yii2 error : common\models\Book has no relation named "favorite". When I try to add: public …

php yii2 relation yii2-model

using onDelete with Doctrine 2

I can't get the onDelete to work in Doctrine2 (with YAML Mapping). I tried this relation in my Product class: …

mapping doctrine-orm yaml relation

Many tables or rows, which one is more efficient in SQL?

I'm building a program that stores news headlines for companies and its timestamp from various sources. Let's say the number …

mysql sql database schema relation

Why Projection Operator in relational algebra eliminates duplicates?

What are the consequences of eliminating duplicates in Projection Operator?And yes, why there is no duplicate elimination in real …

sql select relational-database projection relation

SQL -> Relational Algebra

Suppose I have the following relations: Branch (branchNo(PK), street, city, postcode) Staff (staffNo(PK), fName, lName, sex, branchNo(FK)) …

sql relation relational-algebra

Exception handling inside twig template

i am new to symfony2. my project has two entity [1] Category and [2] Evaluation and category has many evaluation, so the …

symfony exception twig relation

many to many relation does't be unique when I use intermediate model.

I use intermediate model for "ManyToManyField using the through" Normally,If I don't use intermediate field, the m2m relation …

django many-to-many tastypie relation

AirPlay support, MPMoviePlayerController and MPVolumeView relation

I am developing an iPhone application that has support for video play. I am using MPMoviePlayerController with custom controls for …

iphone mpmovieplayercontroller relation airplay mpvolumeview