The difference between a composite key, a foreign key and a primary key is a good illustration of the complex nature of relational database standards.

Learn Primary key -- Primary key -- Constraint -- parimary key constraint -- (value can not be null and cannot repeat) -- there can be only one primary key in a table ...

SQLite will assume an explicitly named integer primary key is just an alias for the rowid if the type is spelled out as "INTEGER" rather than "INT." I can simply change my create table statement as ...

Using SQL Server Management Studio To modify a primary key Open the Table Designer for the table whose primary key you want to modify, right-click in the Table Designer, and choose Indexes/Keys from ...