foreign-keys

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Foreign Key Used in Composite Primary Key

Is it possible to use a composite foreign key as a piece of a table\'s composite primary key? For instance, let\'s say I have two tables:[详细]

2023-04-10 08:43 分类：问答
Insert into table with Identity and foreign key columns

I was trying to insert values from one table to another from two different databases. My issue is I have two tables with a relation and the first table is having an identity column also.[详细]

2023-04-09 21:29 分类：问答
Can a foreign key be NULL and/or duplicate?

Please clarify two things for me: Can a Foreign key be NULL? Can a Foreign key be duplicate? As fair as I know, NULL shouldn\'t be used in foreign keys, but in some application of mine I\'m able t[详细]

2023-04-09 07:54 分类：问答
Foreign Keys auto increment does not work in sqlite .NET provider

I insert multiple data into a sqlite table and get always the same ID back. But the field Id is configured as PK + autoinc Id.[详细]

2023-04-09 01:24 分类：问答
MySQL - Cannot add foreign key to table

I have a database using MySQL 2005. I have two tables, Enrolment and AlertMsg. The primary keys for enrolment are two columns, UnitCode and StudentID. Both these two columns are foreign keys to anoth[详细]

2023-04-08 19:56 分类：问答
SQL Server Replication not replicating Foreign Keys

I am replicating several tables to a database on the same server as the source database. Those tables have several foreign keys between them.When I look at the replicated tables, they d开发者_如何学J[详细]

2023-04-08 18:17 分类：问答
How to update foreign key value in mysql database

I have three tables: categories, languages and categories_languages. Categories_languages is many to many table which links together categories and languages. I would like to update a foregin key valu[详细]

2023-04-08 17:33 分类：问答
update foreignkey items from django shell

Following is the models.py: class UserProfile(models.Model): user = models.OneToOneField(User) belongs_to_user_category = models.ForeignKey(UserCustomCategory, null=True, blank=True)[详细]

2023-04-08 16:22 分类：问答
Do Foreign Key constraints get checked on an SQL update statement that doesn't update the columns with the Constraint?

Do Foreign Key constraints开发者_StackOverflow中文版 get checked on an SQL update statement that doesn\'t update the columns with the Constraint? (In MS SQL Server)[详细]

2023-04-08 15:23 分类：问答
How to avoid creation of foreign keys on Django Models?

when i create a model with a foreign key relationship, something like this: class Post(models.Model): title = models.CharField(max_length=250)[详细]

2023-04-08 08:46 分类：问答