many-to-many

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Many to Many SQL Query for selecting all Images Tagged with certain words

I have 2 Tables in Postgres: CREATE TABLE \"images\" ( \"id\" serial NOT NULL PRIMARY KEY, \"title\" varchar(300) NOT NULL,[详细]

2023-04-12 22:31 分类：问答
Is it possible to use lazy loading with many to many relation in hibernate?

hi i have two entities User and Authority they have many to many relation: @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)[详细]

2023-04-12 15:50 分类：问答
Many-to-Many insert failing - Entity Framework 4.1 DbContext

I am using DB first method, EF 4.1 with DbContext POCO code gen. My database has a many-to-many relationship as shown below:[详细]

2023-04-12 09:32 分类：问答
Logical or of Django many to many queries returns duplicate results

I have models with many to many relationships like this: class Contact(models.Model): name = models.TextField()[详细]

2023-04-12 06:47 分类：问答
A lookup table for one-to-many relationship?

I understand that a lookup table is necessary when we are dealing with many-to-many relationship. But what about one-to-many relationship - do we need a lookup table or a foreign key in one of the ta[详细]

2023-04-12 06:30 分类：问答
Better to use two many to many tables or one table with three Foreign Key References

I\'m Creating a WCF Web Service and mapping my domain model using Fluent Nhibernate and I have noticed that the objects can be represented in different ways and so can the data behind it.[详细]

2023-04-12 05:36 分类：问答
Exclusion of rows with many-to-many relationships

I have three tables: posts, tags and posts_has_tags (which facilitate the many-to-many relationship between posts and tags). A post can have any number of tags.[详细]

2023-04-12 04:09 分类：问答
Client Server Many To Many Design Model (Many Users - Many Applications) in C++

I need to create a mapping records of users and applications (many to many model) in c++. One users can have many applications connected to it, and vice versa, one application can have many users conn[详细]

2023-04-11 11:50 分类：问答
CORE DATA Many to Many relationship. How to update or set relationship?

I have 2 entities Locations and Items. Many to many relationship. So each item can have multiple locations and any location can have multiple items.[详细]

2023-04-11 05:50 分类：问答
Strange ClassNotMappedError with sqlalchemy and Python

I\'m building a rather simple model using sqlalchemy, using a many-to-many relationship defined by an association table and two classes that are to be associated using the declarative syntax.[详细]

2023-04-10 12:16 分类：问答