In an entity-relationship model, a diamond shape typically represents a(n):

A many-to-many relationship between two entities is typically implemented using:

An index on a database column primarily improves the performance of:

A foreign key in a relational database is used to:

Which SQL clause is used to filter groups produced by aggregation?

The process of organizing relations to reduce data redundancy and improve integrity is called:

A relation is in first normal form (1NF) if: