Term
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Definition
parent to child relationship
with one or more subtypes and it contains attributes that are common to its subtypes. |
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Term
| Data Definition Language (DDL) clauses |
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Definition
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Term
What does modality refer to?
How does it appear on ER diagram? |
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Definition
-Refers to the MINIMUM number of times an instance in one entity can be
associated with instance of another entity (minima).
-as a 0 or 1 on the relationship line, next to cardinality |
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Term
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Definition
reference to data
in one relation is based on values in another relation |
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