Feb 11, 2010 · user_id in messages table is a fk field so it has to make clear which id is (user_id). a fully-self-explaining naming convention, in my opinion, could be: fk_[referencing table …

Jan 14, 2014 · To do this without knowing the constraint's name and without inner joins, you can do: IF NOT EXISTS(SELECT NULL FROM …

May 29, 2009 · select fk_table = fk.table_name, fk_column = cu.column_name, pk_table = pk.table_name, pk_column = pt.column_name, constraint_name = c.constraint_name from …

Practically, it depends on how many tables have the FK definitions included. If someone bothered to carefully define all FK references -- and the SELECT statements stick to these rules -- you …

Sep 21, 2016 · sp_rename 'HumanResources.FK_Employee_Person_BusinessEntityID', 'FK_EmployeeID'; will rename FK_Employee_Person_BusinessEntityID found in the …

Jun 1, 2010 · @Kangkan creating FK have nothing to do with performance FK != Indexes. There are DBMS automatic creates a index in the FK creation but most don't. Joins don't need FK …

Aug 26, 2013 · Consider the case of a Customer table with a SSN column (and a dumb primary key), and a Claim table that also contains a SSN column (populated by business logic from the …

Jan 27, 2009 · IF (OBJECT_ID('dbo.FK_ConstraintName', 'F') IS NOT NULL) BEGIN ALTER TABLE dbo.TableName DROP CONSTRAINT FK_ConstraintName END If you need to drop …

However, it makes a lot of sense to index all the columns that are part of any foreign key relationship. An FK-relationship will often need to look up a relating table and extract certain …

YES, a FK can speed up SELECT but slow down INSERT/UPDATE/DELETE. SQL Server uses all constraints (FK included) to build better execution plans for SELECTs. For instance, if you …