Abstract
The paper is a contribution to the problem of semantics-preserving schema restructuring. First, the notion of schema transformation is precisely analysed, its properties of reversibility are stated and an adequate notation is proposed. Then, the paper develops a general family of entity-generating transformations, i.e. operations that add/remove entity types in a schema. This generic transformation is proved to be able to generate not only a large number of popular E-R schema transformations, but also some powerful new ones.
| Original language | English |
|---|---|
| Title of host publication | Proc. of the 10th Entity-Relationship Approach |
| Place of Publication | San Mateo (CA) |
| Publisher | North-Holland |
| Pages | 643-670 |
| Number of pages | 28 |
| Publication status | Published - 1991 |
Keywords
- schema transformation
- database design
- schema equivalence