foreign-key-relationship

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Setting ID for foreign key

I have two tables: Categories (id, name, abbr) Project (id, name, categori开发者_高级运维esID) The relationship is one to many (1 Categories to Many Projects). I use Hibernate DAOs and Mapping to[详细]

2023-04-13 08:21 分类：问答
Django query for many-to-one relation with no instances of the foreign-key relationship

I have a many-to-one relationship between submissions and assignments (a student may have multiple submissions for a single assignment).I would like to create a query that shows the assignments with n[详细]

2023-04-13 06:31 分类：问答
Foreign key shortcuts in table

Imagine a schema as such. NOTE TABLE:NoteID, Note, DetailedTaskID, ..... DETAILED TASK TABLE:DetailedTaskID, WorkOrderID, .....[详细]

2023-04-12 21:10 分类：问答
How to add three foreign key for same child table with three master tables?

Here I have four tables in my database named test_center. Those are: test_user --> PK = u_id test_metadata --> PK = test_id[详细]

2023-04-11 22:21 分类：问答
MySQL foreign keys with non-identifying relationships

All I need is to create 2 tabeles with next structure: The SQL: CREATE TABLE IF NOT EXISTS `ds_cats` ( `id` int(11) NOT NULL AUTO_INCREMENT,[详细]

2023-04-09 06:38 分类：问答
Use DD view all_constraints to check if a FK constraint would work

My professor whom is teaching a database course asked the following question - currently I have no idea where to start as this seems like an unusual question to ask.[详细]

2023-04-05 20:09 分类：问答
how to use foreign keys as primary key

i have a table with two foreign keys as composite key. ActivityTbl - (activityNbr(PK), supervisor(FK), status, type, startDate, endDate, location )[详细]

2023-04-05 12:15 分类：问答
Unable to create Foreign Key

There are two tables: Table Course with columns CourseID (PK, int, not null) and DepartmentID (PK, FK, int, not null), and[详细]

2023-04-04 14:38 分类：问答
Handling One to One foreign key relationships - LightSwitch

I am currently trying to add a one to one foreign key relationship in LightSwitch. It is be开发者_如何学编程tween an ID and a username. Ideally I would be able to show the username wherever the relate[详细]

2023-04-03 12:22 分类：问答
Remove Dependent Entity When Relationship Deleted

Say I have two entities like so: public class Response { public int Id { get; set; } public int PatientId { get; set; }[详细]

2023-04-02 19:32 分类：问答