How do I make a composite key with SQL Server Management Studio?
Sep 3, 2020 · Open up the table designer in SQL Server Management Studio (right-click table and select 'Design') Holding down the Ctrl key highlight two or more columns in the left hand table margin
How can I define a composite primary key in SQL?
May 13, 2022 · 173 How can I define a composite primary key consisting of two fields in SQL? I want to make a table name voting with fields QuestionID, MemberID, and vote. And the Composite primary …
sql - How to add composite primary key to table - Stack Overflow
Aug 29, 2009 · create table d(id numeric(1), code varchar(2)) After I create the above table how can I add a composite primary key on both fields and also a foreign key?
sql - How do composite indexes work? - Stack Overflow
Composite indexes work just like regular indexes, except they have multi-values keys. If you define an index on the fields (a,b,c) , the records are sorted first on a, then b, then c.
Creating a composite foreign key in SQL Server 2008
Jan 30, 2017 · Creating a composite foreign key in SQL Server 2008 Asked 14 years, 5 months ago Modified 8 years, 10 months ago Viewed 94k times
sql - Composite Primary Keys : Good or Bad? - Stack Overflow
SQL (and the relational model) allows a composite primary key. It is a good practice in some cases. Or, another way of looking at it is that it's not a bad practice in all cases. Some people have the opinion …
Composite Unique Constraint SQL - Stack Overflow
Jun 14, 2016 · I have a table with parents and children, each record has a PRIMARY KEY id, a 'name', and a 'parent' that references another record's 'id'. Can I enforce UNIQUE constraint on the 'name' …
sql - Composite Primary key vs additional "ID" column? - Stack Overflow
What determines whether the candidate/primary key should be {Author,Title,Edition} or whether an ID column should be used, with {Author,Title,Edition} a unique index/key constraint?
What's wrong with nullable columns in composite primary keys?
In Sql Server a unique constraint that has a nullable column, allows the value 'null' in that column only once (given identical values for the other columns of the constraint). So such a unique constraint …
sql - Change Primary Key to Composite Key (Primary Key already exists ...
I am trying to change the primary key of a table in my SQL database from the existing key to a composite key, which does not include the existing column. The following code is not working due to the