Below is an example of a conceptual schema: A logical data model or logical schema is a representation of the abstract structure of the information domain that defines all the logical constraints ...

The candidate key is also known as the primary key, or if a structure has multiple candidate keys, then one of them is designated as the primary key. When building up a logical ... of business data ...

The fundamental data structure in a ... a data element is a logical definition of data, whereas a field is the physical unit of storage in a record. For example, the data element ACCOUNT NUMBER ...