Why can a database table have only one primary key?
33176
Can I have multiple primary keys in a single table?
93655
How to prove the lack of implicit order in a database?
118020
Primary key or Unique index?
77955
Foreign key not working in MySQL: Why can I INSERT a value that's not in the foreign column?
149263
How do I find all tables in a DB that have no explicit primary key?
59139
Remove Primary Key in MySQL
132527
Unique constraint that allows empty values in MySQL
27724
Why would you put Identity Increment other than 1 in SQL?
9736
How do you list the primary key of a SQL Server table?
149602
One to at most one relation or multiple null columns?
41314
Is there a REAL performance difference between INT and VARCHAR primary keys?
153310
Composite primary key from multiple tables / multiple foreign keys
100589
Entity Framework 4 Single() vs First() vs FirstOrDefault()
128621
Mysql - Add auto_increment to primary key
44786
Primary key for link/junction table with time-dependent data
63366
Guid vs INT - Which is better as a primary key?
59729
What is the purpose of the database 'owner'?