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 ...
List of foreign keys and the tables they reference in Oracle DB
Mar 19, 2019 · I'm trying to find a query which will return me a list of the foreign keys for a table and the tables and columns they reference. I am half way there with SELECT a.table_name, …
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 …
INSERT statement conflicted with the FOREIGN KEY constraint
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 …
How to create a foreign key in phpmyadmin - Stack Overflow
Jun 3, 2016 · 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 …
sql - Foreign Keys vs Joins - Stack Overflow
Jun 1, 2010 · Joins are defined using foreign keys only False! Using foreign key will better the performance Also false. In fact, if anything, FK's can hurt performance, though only rarely to …
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 …
How do I drop a foreign key in SQL Server? - Stack Overflow
Sep 18, 2008 · The object 'Company_CountryID_FK' is dependent on column 'CountryID'. Msg 4922, Level 16, State 9, Line 2 ALTER TABLE DROP COLUMN CountryID failed because one …
Add new column with foreign key constraint in one command
Jul 15, 2013 · I am trying to add a new column that will be a foreign key. I have been able to add the column and the foreign key constraint using two separate ALTER TABLE commands: …
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 …