A Relational-Calculus Query Language For Historical Databases
Abbreviated Journal Title
HISTORICAL DATABASES; QUERY LANGUAGES; BOOLEAN OPERATORS; TEMPORAL; LOGIC; RELATIONAL-CALCULUS; RELATIONAL USER INTERFACES; TEMPORAL DATABASES; MODEL; Computer Science, Software Engineering
In this paper, an approach to handle time in relational query languages is outlined. The approach is based on extending Boolean and comparison operators by allowing their operands to be sets of intervals. The proposed temporal logic is shown to satisfy the properties of the normal Boolean logic. A relational-calculus query language using the extended logic is developed. The extended logic presented in this paper provides a good degree of flexibility in expressing different temporal requirements and therefore promises to be a successful approach for designing powerful temporal query languages.
"A Relational-Calculus Query Language For Historical Databases" (1992). Faculty Bibliography 1990s. 405.