logical connectives - sqlsqls extended truth
Logical Connectives - SQL
SQL's extended truth tables in which the symbol, for unknown, appears along with the usual T and F.
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predicate - sqlconsider the declarative sentence-a proposition-that is used to introduce this topic student s1 named anne is enrolled on course
substitution and instantiation - sqlit shows how null might appear in substitution for a parameter of a predicate and how it might thus participate
table represents an extension - sqlit describes how each tuple in a relation represents a true instantiation of some predicate and each true
deriving predicates from predicates in sqlthe corresponding section in the theory book describes how predicates can be derived from predicates using
logical connectives - sqlsqls extended truth tables in which the symbol for unknown appears along with the usual t and f negation not not conjunction
quantification in sqlto quantify something as the theory book has it is to state its quantity to say how many of it there are for example in tutorial
existential quantification - sqlexistential quantification-stating that something is true of at least one object under consideration-can be expressed
relational algebra - sqlit describes some operators that together constitute an algebra that is not only relationally complete but also irreducibly
relational operators and logical operatorsit prepares the ground for subsequent sections in which each specific relational operator is paired with
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