Abstract
Information retrieval is an integral component of any database management system. Temporal database management systems should offer user-friendly and powerful means of retrieval of data according to temporal criteria. The From clause is an important component of the Select statement: it identifies the underlying relations from which the information is to be retrieved and allows the declaration of range variables. While variables merely serve as “correlation names” (e.g. for joining a table with itself) in SQL-92, TSQL2 variables are designed to increase the temporal expressiveness of the language, in addition to provide “syntactic sugar” in making some queries easier to formulate.
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© 1995 Springer Science+Business Media New York
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Snodgrass, R.T., Jensen, C.S., Grandi, F. (1995). The From Clause. In: Snodgrass, R.T. (eds) The TSQL2 Temporal Query Language. The Springer International Series in Engineering and Computer Science, vol 330. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2289-8_12
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DOI: https://doi.org/10.1007/978-1-4615-2289-8_12
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