Differences between "foreign key" and "constraint foreign key"
Sep 29, 2012 · 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 …
How can I list all foreign keys referencing a given table in SQL …
Jan 27, 2009 · I need to remove a highly referenced table in a SQL Server database. How can I get a list of all the foreign key constraints I will need to remove in order to drop the table? (SQL …
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` …
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, …
SQL Server: Howto get foreign key reference from …
Oct 11, 2010 · @Seth Reno: This is correct in Microsoft SQL Server, because there you can reference a unique index in a foreign key. But the SQL-standard doesn't allow this, and this …
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 …
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 …
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 …
Is it fine to have foreign key as primary key? - Stack Overflow
Jun 11, 2012 · Primary keys always need to be unique, foreign keys need to allow non-unique values if the table is a one-to-many relationship. It is perfectly fine to use a foreign key as the …
sql - Foreign Key to non-primary key - Stack Overflow
Aug 26, 2013 · AnotherID INT NOT NULL, MoreData VARCHAR(30) NOT NULL, CONSTRAINT fk_table2_table1 FOREIGN KEY (AnotherID) REFERENCES table1 (AnotherID) ) However, …
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