foreign-keys

Am working on bigger project where we have multiple schemas in one Postgres DB. We have created foreign keys between schemas. Here is an example > We have company schema and user schema. Company schema has company_users table which have foreign key restriction on user.users table CREATE TABLE company.company_user ( id serial NOT NULL, company_id integer NOT NULL, user_id integer NOT NULL, created_at timestamp(0) without time zone, updated_at timestamp(0) without time zone, deleted_at timestamp(0) without time zone, CONSTRAINT company_user_pkey PRIMARY KEY (id), CONSTRAINT company_user_company

How do I create a foreign key from table tGeoAnswers column 'locationId' to table tLocations column 'id'? ALTER TABLE tGeoAnswers ADD FK_Answer_Location FOREIGN KEY (locationId) REFERENCES tLocations(id) I am trying this code that I found but I get the following error: The definition for column 'FK_Answer_Location' must include a data type ALTER TABLE tGeoAnswers ADD CONSTRAINT FK_Answer_Location ... Otherwise it assumes you're adding a column called FK_Answer_Location . Assuming MsSql Server/T-SQL, use ALTER TABLE : ALTER TABLE tGeoAnswers ADD CONSTRAINT FK_Answer_Location FOREIGN KEY

I have this two models: class Rule(models.Model): name = models.CharField(max_length=200) class Channel(models.Model): id = models.CharField(max_length=9, primary_key=True) name = models.CharField(max_length=100) rule = models.ForeignKey(Rule, related_name='channels', blank=True) And I have to be able to add channels to rule in admin site within RuleAdmin interface. So I created this two admin models: class ChannelAdmin(admin.TabularInline): model = Channel class RuleAdmin(admin.ModelAdmin): model = Rule inlines = [ChannelAdmin] But when I start my server I got this errors: ERRORS: <class

First off, I'm a real newbie to db and sql. However, I have to tables, PERSON and SPECIES and I want to add a foreign key to the table SPECIES. When trying to add the foreign key I always get the error message "ORA-900904: invalid identifier". I just can't figure out what I've done wrong and why it doesn't work?!?! This was my approach: PERSON table and primary key create table person ( name varchar2 (30), firstname varchar2 (30), persid number (8) not null ) ; alter table person add constraint person_pk primary key (persid) ; SPECIES table and primary key create table species ( speciesnamelat

I am in the process of changing the back-end of an existing application to use Entity Framework Code First. I've used the built-in tool in Visual Studio 2015 to generate POCO classes based on my existing database. This worked perfectly for the most part, except for two classes, with a one-to-zero-or-one relationship. These are my (simplified) classes: public class Login { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } public int TeamMemberId { get; set; } public virtual TeamMember TeamMember { get; set; } } public class TeamMember { [Key]

I want to get relations (or foreign keys) of a Sql Server Table in my c# code. How can i do this? Thank you This will get all the foreign keys that dbo.YourTableName references: SELECT FK = OBJECT_NAME(pt.constraint_object_id), Referencing_col = pc.name, Referenced_col = rc.name FROM sys.foreign_key_columns AS pt INNER JOIN sys.columns AS pc ON pt.parent_object_id = pc.[object_id] AND pt.parent_column_id = pc.column_id INNER JOIN sys.columns AS rc ON pt.referenced_column_id = rc.column_id AND pt.referenced_object_id = rc.[object_id] WHERE pt.parent_object_id = OBJECT_ID('dbo.YourTableName');

I've read a number of posts about this error, but none of the solutions have managed to solve the problem (assuming I've tried them correctly). This is the code that causes the error: CREATE TABLE season ( id smallint unsigned NOT NULL auto_increment, title varchar(25) NOT NULL, PRIMARY KEY (id) ); CREATE INDEX seasonId ON season(id); DROP TABLE IF EXISTS event; CREATE TABLE event ( id smallint unsigned NOT NULL auto_increment, title varchar(255) NOT NULL, season_id smallint NOT NULL, PRIMARY KEY (id), FOREIGN KEY (season_id) REFERENCES season(id) ON UPDATE RESTRICT ON DELETE RESTRICT ); So