foreign-keys

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Foreign keys and save method in Django

I have the following model : class A: b = ForeignKey(\'B\') class B: a = ForeignKey(\'A\', null=True) I have several methods that decode a json object and create a tree of objects A and B.[详细]

2023-04-03 19:45 分类：问答
Mysql and FK's Problem

i\'m having trouble with some tables here. i have this table: CREATE TABLE `smenuitem` ( `nome` VARCHAR(150) NULL DEFAULT NULL COLLATE \'utf8_unicode_ci\',[详细]

2023-04-03 17:17 分类：问答
Django models: mutual references between two classes and impossibility to use forward declaration in python

I have defined two models where each one references the other, like so: class User(models.Model): # ...[详细]

2023-04-03 00:09 分类：问答
How to set a foreign key and retrieve or delete data from multiple tables?

I am new to php and mysql. I created a database named \'students\' which contain two tables as \'student_details\' which have fields like \'ID, Name, Age, Tel#, Address\' and another table as \'fee_de[详细]

2023-04-02 15:40 分类：问答
Django / Sqlite3 add a row for model with a foreign key

I\'m new to both Django and SQlite3. I have a model (Person), with a foreign key to (Person_Type): class Person(models.Model):[详细]

2023-04-02 14:49 分类：问答
How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?

Can anyone explain how to implement one-to-one, one-to-ma开发者_运维问答ny and many-to-many relationships while designing tables with some examples?One-to-one: Use a foreign key to the referenced tabl[详细]

2023-04-02 11:48 分类：问答
Will FK validation in SQL Server always use the index specified in sys.foreign_keys?

I can\'t find anything discussing the case where there are multiple possible indexes that could be used to backup a FK constraint.[详细]

2023-04-02 11:23 分类：问答
MySQL 2 foreign keys in 1tbl referencing 1 primary key

I have 2 tables in my DB, and I can\'t quite define the relations correctly: tbl_users holds some info about system users AND admins (I \"packed\" 2 different tables - tbl_users and tbl_admins - tog[详细]

2023-04-02 09:48 分类：问答
mysql drop foreign key without table copy

I have an InnoDB table claims which has about 240 million rows. The table has a foreign key constraint: CONSTRAINT FK78744BD7307102A9 FOREIGN KEY (ID) REFERENCES claim_details (ID). I want to delete t[详细]

2023-04-02 09:42 分类：问答
Foreign Key to User model

I want to create a new model, something like: user_name = models.ForeignKey(u"Username", User),[详细]

2023-04-02 07:20 分类：问答