2009年11月7日 · Foreign Key: A foreign key (sometimes called a referencing key) is a key used to link two tables together. Typically you take the primary key field from one table and insert it into the other table where it becomes a foreign key (it remains a primary key in the original table).

2016年6月3日 · To generate a foreign key you need to create first index of that field.After you create an index.Then go to relation view you will see that field also along with primary key .

2024年6月12日 · I have a Transactions table which has a column Customer ID (foreign Key) and a Customer table having ID (primary key). How do I show in an the relation between the two tables showing that the Cust...

2018年10月27日 · I found the following code correctly created the foreign key without having to do any custom migration code; just the usual AutoMigrate. type Account struct { ID uint `gorm:"primary_key"` } type Transaction struct { ID uint `gorm:"primary_key"` AccountID uint Account Account `gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"` } I am using …

2015年3月18日 · In Django, is there any way to set a foreign key to a field of another model? For example, imagine I have a ValidationRule object. And I want the rule to define what field in another model is to be

2011年10月3日 · I have been searching for resources on how to declare foreign key relationships and other constraints using code first EF 4.1 without much luck. Basically I am building the data model in code and u...

2013年8月26日 · A FOREIGN KEY constraint does not have to be linked only to a PRIMARY KEY constraint in another table; it can also be defined to reference the columns of a UNIQUE constraint in another table.

2020年6月30日 · @CristianoBombazar - you can set meetingID either way; but it is probably more common to set the value manually, as it typically has some semantic meaning and/or is scoped by the associated Event. Thus the composite primary key.

2008年9月18日 · Just be aware that it is dangerous to drop a foreign key constraint without knowing why it is there inthe first place. If you just created this and did it by mistake then use the code provided in the other answers.

2012年6月11日 · It is perfectly fine to use a foreign key as the primary key if the table is connected by a one-to-one relationship, not a one-to-many relationship. If you want the same user record to have the possibility of having more than 1 related profile record, go with a separate primary key, otherwise stick with what you have.