foreign-key-relationship

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Inserting 2 rows, each to different tables where one row refrences the other's primary key

Hello folks Checkout this scenario Table 1 columns -> | table_1_id (pkey) | some_column | comments | Table 2 columns -> | table_2_id (pkey) | some_other_column | table_1_id (fkey) | comments |[详细]

2023-02-05 17:13 分类：问答
Django Model Inheritance and Relationships

I\'ve got a django app, where I\'d like to define a relationship between two classes at a base level. It also makes sense to me to 开发者_如何学运维define the relationship between the children of thos[详细]

2023-02-04 15:15 分类：问答
SQL Server 2008: The columns in table do not match an existing primary key or unique constraint

I need to make some changes to a SQL Server 2008 database. This requires the creation of a new table, and inserting a foreign key in the new table that references the Primary key of an already exist[详细]

2023-02-04 07:24 分类：问答
Database Design: Explain this schema

Full disclosure...Trying feverishly here to learn more about databases so I am putting in the time and also tried to get this answer from the source to no avail.[详细]

2023-02-03 13:23 分类：问答
How to let a column accept null values as zero (0) in Self-Relation table

As described in the image, I got a parent-Children relation and since the ParentID not accepting null values (and I can\'t change to nullabel due to some restriction in the UI I have), how can I rem[详细]

2023-02-03 09:28 分类：问答
Sql Server: What is the benefit of using "Enforce foreign key constraint" when it's set to "NO"?

I know the pur开发者_如何转开发pose of \"Enforce foreign key constraint\" in RDBMS. But is there any benefit when it\'s set to \"NO\" ?In normal production, this setting should never be set to NO.[详细]

2023-02-02 06:34 分类：问答
Database Table Referencing Several Records

I\'m looking for some guidance as to how to set up a database I am creating.I think the best way to ask the question is to describe the specific scenario:[详细]

2023-02-01 14:33 分类：问答
Relational tables: a 3rd table with relations

I\'m building a php page that will show an specific banner when the user enters his/her phone number in a form field.[详细]

2023-01-31 02:19 分类：问答
Entity Framework 4 - Associations

EF 4 does not support associations that are not based on foreign/primary keys.There are lots of occasions where you need to navigate between tables using non-key fields.[详细]

2023-01-29 23:19 分类：问答
Selecting from relations on squeryl

I am testing(trying) squeryl\'s relations modeling feature class Foo(val id: Long, val foBar: Long) extends KeyedEntity[Long]{[详细]

2023-01-29 13:06 分类：问答