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 ...
What is a proper naming convention for MySQL FKs?
Feb 10, 2010 · 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 …
Como adicionar uma foreign key em uma tabela já criada
Jan 30, 2016 · 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 …
Does a foreign key automatically create an index?
An FK-relationship will often need to look up a relating table and extract certain rows based on a single value or a range of values. So it makes good sense to index any columns involved in an FK, but an …
How do I create a foreign key in SQL Server? - Stack Overflow
I agree naming constraints is a good plan but, in SQL Server 2008 R2 at least, the syntax of the last line has to be "constraint fk_questionbank_exams foreign key (question_exam_id) references exams …
INSERT statement conflicted with the FOREIGN KEY constraint - SQL ...
The way a FK works is it cannot have a value in that column that is not also in the primary key column of the referenced table. What is missing from that answer is: You must build the table containing the …
How to find foreign key dependencies in SQL Server?
May 29, 2009 · How can I find all of the foreign key dependencies on a particular column? What are the different alternatives (graphically in SSMS, queries/views in SQL Server, 3rd party database tools, …
Differences between "foreign key" and "constraint foreign key"
Sep 29, 2012 · I mean for example I can create table like create table XTable ( idt int not null primary key, value nvarchar(50), idq int, constraint fk_idq foreign key(idq) references YTable(idq) ) and...
How do I drop a foreign key in SQL Server? - Stack Overflow
Sep 18, 2008 · Your syntax for dropping the FK doesn't need the words "foreign key". This is the syntax for MySQL, not SQL Server. You can replace it with the word "constraint".
mysql - FK or FPK? Relational Databases - Stack Overflow
Jun 28, 2017 · What do you mean by "FK" (foreign key) then? What academic (organization/person) textbook are you using? In the relational model (but not SQL): A superkey is a set of columns with …