Final answer:
In a database, a complete set of attributes for a single occurrence of an entity class is referred to as a record. It includes all the data pertinent to an entity, like a student's various personal details.
Step-by-step explanation:
In a database, a complete set of attributes for a single occurrence of an entity class is called a record. An entity class represents a concept or thing in which information is stored, such as a person, place, event, or thing, and each attribute is a piece of information that describes some aspect of the entity.
For instance, if the entity class is 'Student', a record for a single student might contain attributes like Student ID, Name, Date of Birth, and Major, with each of these attributes holding the data for one student. The term record can also be used interchangeably with 'row' in the context of a relational database where data is organized in tables. However, it should not be confused with a key, which is a field in a table used for sorting or uniquely identifying records, a file, which is a collection of records, or a character, which is a single alphabetic, numeric, or other symbol used in building up data.