| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | A Prolog and Relational Algebra Interface | .... 3 |
| 3 | Improvement | .... 4 |
| 4 | Improved Plan Generator | .... 7 |
| 5 | Plan Optimizer | .... 8 |
| 6 | Conclusion | .... 9 |
| Appendix | .... 9 | |
| References | .... 10 | |
| End | .... 11 |
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