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Differences between foreign key and constraint foreign key The first one assigns a user-defined name to the foreign key, the second one will assign a system-generated name to the foreign key User-defined foreign key names can be useful for subsequent statements like these: ALTER TABLE XTable DROP CONSTRAINT fk_idq; ALTER TABLE XTable ENABLE CONSTRAINT fk_idq; ALTER TABLE XTable DISABLE CONSTRAINT fk_idq; It's harder to alter constraints with system
What is a proper naming convention for MySQL FKs? The reason for creating a symbolic name is for referencing when you want need to drop the constraint Oracle SQL Server allow you to disable specific constraints If you don't have fk in the name, you have to confirm the constraint is a foreign key constraint
foreign key constraint naming scheme - Stack Overflow What is a standard naming scheme to use for foreign key constraints? Given these tables task (id, userid, title) note (id, taskid, userid, note); user (id, name) where Tasks have Notes, Tasks are
mysql - Add Foreign Key to existing table - Stack Overflow I want to add a Foreign Key to a table called "katalog" ALTER TABLE katalog ADD CONSTRAINT `fk_katalog_sprache` FOREIGN KEY (`Sprache`) REFERENCES `Sprache` (`ID`) ON DELETE SET NULL ON UPDATE
How to rename FK in MS SQL - Stack Overflow will rename FK_Employee_Person_BusinessEntityID found in the HumanResources schema to FK_EmployeeID If the schema is missing, SQL Server looks for objects in the user's default schema, which is often the dbo schema
How to create a foreign key in phpmyadmin - Stack Overflow Thank you Alok! great answer I am new to using php so this is a great help - If I opt to create the foreign key using an sql statement - ` ALTER TABLE Patient ADD CONSTRAINT fk_to_Doctorid FOREIGN KEY (Doctorid) REFERENCES Doctor (DoctorId); ` will I have to index the column before doing this?
How do I create a foreign key in SQL Server? - Stack Overflow This script is about creating tables with foreign key and I added referential integrity constraint sql-server create table exams ( exam_id int primary key, exam_name varchar(50), ); create table question_bank ( question_id int primary key, question_exam_id int not null, question_text varchar(1024) not null, question_point_value decimal, constraint question_exam_id_fk foreign key references
Como adicionar uma foreign key em uma tabela já criada Sou iniciante em mysql e não consigo adicionar uma fk em uma tabela que criei Tenho duas tabelas (pessoa, objeto) e desejo criar uma 'fk_pessoa' em objeto que receba o valor do atributo 'id' de p
What is the use for Auto FK index in pgAdmin? - Stack Overflow When you select the "Auto FK index" option, pgAdmin will generate necessary SQL code that creates an index on the specified column It is often beneficial to index columns that are referenced