Can and should relational database contain tables that don't have primary keys?
58229
Is a table without a primary key normalized?
64483
Inserting into related tables
138755
Designing a friendships database structure: Should I use a multivalued column?
158985
Can a foreign key be NULL and/or duplicate?
95344
How do I insert a row which contains a foreign key?
105896
Finding a Primary Key Constraint on the fly in SQL Server 2005
139969
How to represent it with UNIQUE indexes and foreign keys?
106066
Integrity constraints in a relational database - should we overlook them?
3575
List of foreign keys and the tables they reference in Oracle DB
30463
Are you allowed to use numbers as table names in MySQL?
136937
When should a primary key be declared non-clustered?
66985
Is there a name for this database schema of key values?
33461
Mapping ManyToMany with composite Primary key and Annotation:
86642
Sqlite primary key on multiple columns
8176
Relational Database Design Patterns?
47564
Foreign Key column mapped to multiple primary keys
77984
Changing MySQL primary key when foreign key contraints exist