Jeffrey D. Ullman. Principles of database systems. Second edition. Computer software engineering series. Computer Science Press, Rockville, Md., 1982, vii + 484 pp. - David Maier. The theory of relational databases. Computer Science Press, Rockville, Md., 1983, xv + 637 pp. - Ashok K. Chandra and David Harel. Computable queries for relational data bases. Journal of computer and system sciences, vol. 21 (1980), pp. 156–178.

J. A. Makowsky

doi:10.2307/2273929

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Jeffrey D. Ullman. Principles of database systems. Second edition. Computer software engineering series. Computer Science Press, Rockville, Md., 1982, vii + 484 pp. - David Maier. The theory of relational databases. Computer Science Press, Rockville, Md., 1983, xv + 637 pp. - Ashok K. Chandra and David Harel. Computable queries for relational data bases. Journal of computer and system sciences, vol. 21 (1980), pp. 156–178.

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Jeffrey D. Ullman. Principles of database systems. Second edition. Computer software engineering series. Computer Science Press, Rockville, Md., 1982, vii + 484 pp. - David Maier. The theory of relational databases. Computer Science Press, Rockville, Md., 1983, xv + 637 pp. - Ashok K. Chandra and David Harel. Computable queries for relational data bases. Journal of computer and system sciences, vol. 21 (1980), pp. 156–178.

To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.

Jeffrey D. Ullman. Principles of database systems. Second edition. Computer software engineering series. Computer Science Press, Rockville, Md., 1982, vii + 484 pp. - David Maier. The theory of relational databases. Computer Science Press, Rockville, Md., 1983, xv + 637 pp. - Ashok K. Chandra and David Harel. Computable queries for relational data bases. Journal of computer and system sciences, vol. 21 (1980), pp. 156–178.

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