Difference between revisions of "Databases"
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* Each tuple (row) has a value for each attribute | * Each tuple (row) has a value for each attribute | ||
* Each attribute has a type (or domain) | * Each attribute has a type (or domain) | ||
| + | * All queries return relations (tables), so it can said to be compositional or closed. | ||
Revision as of 22:40, 7 December 2013
Relational Databases
- Set of named relations (tables)
- Each relation has a set of named attributes (columns)
- Each tuple (row) has a value for each attribute
- Each attribute has a type (or domain)
- All queries return relations (tables), so it can said to be compositional or closed.
