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Comments on "Extensions to SQL for Historical Databases"
August 1992 (vol. 4 no. 4)
pp. 399

The commenters point out that the author of the above-titled paper failed to acknowledge their contemporary publications of almost identical results and the subsequent, comprehensive refinement of this work. The author replies that he did not have access to their publications. He indicates some differences between their work and his.

[1] N. A. Lorentzos, "A formal extension of the relational model for the representation and manipulation of generic intervals," Ph.D. disseratation, Dep. Comput. Sci, Birkbeck College, London Univ., Oct. 1988.
[2] N. A. Lorentzos and R. G. Johnson, "TRA: A model for a temporal relational algebra, " inProc. IFIP TC 8/WG 8.1 Working Conf. on Temporal Aspects in Information Systems, Sophia Antipolis, France, 1988, pp. 203-215.
[3] N. A. Lorentzos and R. G. Johnson, "Extending relational algebra to manipulate temporal data,"Inform. Syst., vol. 13, no. 3, pp. 289-296, 1988.
[4] N. A. Lorentzos and R. G. Johnson, "An extension of the relational model to support generic intervals," inProc. Int. Conf. on Extending Database Technology, Italy, Mar. 1988, pp. 528-542.
[5] N. A. Lorentzos and V. J. Kollias, "The handling of depth and time intervals in soil information systems,"Comput. Geosci., vol. 15, no. 3, pp. 395-401, 1989.
[6] N. L. Sarda, "Algebra and query language for a historical data model,"Comput. J., to be published.
[7] E. McKenzie and R. Snodgrass, "An evaluation of historical algebras," TR87-020, Univ. North Carolina, Oct. 1987.

Index Terms:
SQL; historical databases; relational databases
R.G. Johnson, N.A. Lorentzos, N.L. Sarda, "Comments on "Extensions to SQL for Historical Databases"," IEEE Transactions on Knowledge and Data Engineering, vol. 4, no. 4, pp. 399, Aug. 1992, doi:10.1109/69.149934
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