Huff, S.H., Berthelson, C.L., and Pryor, T.A. Evaluation of an SQL model of the HELP patient database. Proceedings of the Fifteenth Annual SCAMC. Washington, DC. P.D. Clayton (Ed.) IEEE Computer Society. November 1991.  Home/Search   Document Not in Database   Summary   Related Articles

....by the benefits in representation flexibility that the model provides. We have also discussed a method to create a temporal version of the relational query language, SQL. The difficulty of making temporal queries in standard SQL has been encountered by other researchers in medical informatics [12]. We are able to overcome these difficulties by developing a temporal relational algebra for histories based on our set of temporal operations. We extend the syntax of SQL with new terms, so that the semantics of an SQL for histories (TLSQL) can be understood in terms of the underlying algebraic ....

Huff, S.H., Berthelson, C.L., and Pryor, T.A. Evaluation of an SQL model of the HELP patient database. Proceedings of the Fifteenth Annual SCAMC. Washington, DC. P.D. Clayton (Ed.) IEEE Computer Society. November 1991.

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