UNION (RSO)
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an operator used to merge (append) two tables into a new table, dropping
the duplicate rows
extended entity relationship model (EERM)
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Sometimes referred to as the enhanced entity relationship model; the result
of adding more semantic constructs, such as entity supertypes, entity
subtypes, and entity clustering, to the original entity relationship (ER)
model
, recursive relationship
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A relationship found within a single entity type. For example, an EMPLOYEE
is married to an EMPLOYEE or a PART is a component of another PART
1:1 Relationship
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one entity in a 1:1 relationship can be related to only one other entity, and
vice versa. Rare in any relational database
Inheritance
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enables an entity subtype to inherit the attributes and relationships of the
supertype.
Select (RSO)
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an operator used to merge (append) two tables into a new table, dropping
the duplicate rows
extended entity relationship model (EERM)
Give this one a try later!
Sometimes referred to as the enhanced entity relationship model; the result
of adding more semantic constructs, such as entity supertypes, entity
subtypes, and entity clustering, to the original entity relationship (ER)
model
, recursive relationship
Give this one a try later!
A relationship found within a single entity type. For example, an EMPLOYEE
is married to an EMPLOYEE or a PART is a component of another PART
1:1 Relationship
Give this one a try later!
one entity in a 1:1 relationship can be related to only one other entity, and
vice versa. Rare in any relational database
Inheritance
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enables an entity subtype to inherit the attributes and relationships of the
supertype.
Select (RSO)
Give this one a try later!
