EER Model - subclasses which are neither disjoint nor fully overlapping
Suppose we are writing an EER diagram for a company's database. This company offers two services $A$ and $B$. If the two services were disjoint, then this might look something like
In many cases you could request both services from the company, in which case an we would use an "o" instead of a "d".
Suppose that for this company, you can either request service A and B together, or service A only. What is a good way to describe this constraint succinctly in the diagram?
database-design schema
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knrumseyknrumsey
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Suppose we are writing an EER diagram for a company's database. This company offers two services $A$ and $B$. If the two services were disjoint, then this might look something like
In many cases you could request both services from the company, in which case an we would use an "o" instead of a "d".
Suppose that for this company, you can either request service A and B together, or service A only. What is a good way to describe this constraint succinctly in the diagram?
database-design schema
asked 1 min ago
knrumseyknrumsey
1011
New contributor
knrumsey is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Suppose we are writing an EER diagram for a company's database. This company offers two services $A$ and $B$. If the two services were disjoint, then this might look something like
In many cases you could request both services from the company, in which case an we would use an "o" instead of a "d".
Suppose that for this company, you can either request service A and B together, or service A only. What is a good way to describe this constraint succinctly in the diagram?
database-design schema
asked 1 min ago
knrumseyknrumsey
1011
New contributor
knrumsey is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Suppose we are writing an EER diagram for a company's database. This company offers two services $A$ and $B$. If the two services were disjoint, then this might look something like
In many cases you could request both services from the company, in which case an we would use an "o" instead of a "d".
Suppose that for this company, you can either request service A and B together, or service A only. What is a good way to describe this constraint succinctly in the diagram?
database-design schema
database-design schema
asked 1 min ago
knrumseyknrumsey
1011
New contributor
knrumsey is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 min ago
knrumseyknrumsey
1011
New contributor
knrumsey is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 min ago
knrumseyknrumsey
1011
New contributor
knrumsey is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 min ago
knrumseyknrumsey
1011
asked 1 min ago
knrumseyknrumsey
1011
1011
New contributor
knrumsey is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
knrumsey is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
knrumsey is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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