Difference between revisions of "Databases"
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* 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. | * All queries return relations (tables), so it can said to be compositional or closed. | ||
| + | |||
| + | = XML Data = | ||
| + | |||
| + | * Alternative to relational model to store data | ||
| + | * Standard for data representation and exchange | ||
| + | * Document format similar to HTML, however tags represent content instead of formatting. | ||
Revision as of 22:52, 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.
XML Data
- Alternative to relational model to store data
- Standard for data representation and exchange
- Document format similar to HTML, however tags represent content instead of formatting.
