Deriving Predicates from Predicates in SQL

The corresponding section in the theory book describes how predicates can be derived from predicates using (a) the logical connectives of the propositional calculus, such as AND, OR, and NOT, and (b) quantifiers, such as "there exists" (∃) and "for all" (∀). Here I examine how SQL's truth value, unknown, intrudes on those connectives and quantifiers.

Posted Date: 1/18/2013 3:10:01 AM | Location : United States

Ask an Expert

Related Discussions:- Deriving predicates from predicates in sql, Assignment Help, Ask Question on Deriving predicates from predicates in sql, Get Answer, Expert's Help, Deriving predicates from predicates in sql Discussions

Write discussion on Deriving predicates from predicates in sql
Your posts are moderated

Write your message here..

Related Questions

I need simple hosted sql database, Project Description: I want a small r... Project Description: I want a small relational database to be built. I want the database to have the subsequent information tables: Employee Information Document storage

Example of shorthand for a row constraint - sql, Example of Shorthand for a... Example of Shorthand for a row constraint Example: Shorthand for a row constraint ALTER TABLE EXAM_MARK ADD CONSTRAINT Mark_in_range CHECK (Mark BETWEEN 0 AND 100);

Data types, Datatypes Every constant and variable has a datatype that s... Datatypes Every constant and variable has a datatype that specifies the storage format, constraints, and the valid range of values. The PL/SQL gives a variety of predefined dat

Declarations in sql-pl/sql, Declarations in SQL Your program stores value... Declarations in SQL Your program stores values in the variables and constants. As the program executes, the value of the variables can change, but the values constants cannot.

Joining in sql, Joining in SQL Joining IS_CALLED and IS_ENROLLED_ON in... Joining in SQL Joining IS_CALLED and IS_ENROLLED_ON in SQL SELECT * FROM IS_CALLED NATURAL JOIN IS_ENROLLED_ON This is an example of an SQL table expression. I have been

Transaction visibility, Transaction Visibility As the figure shows, th... Transaction Visibility As the figure shows, the changes made by an autonomous transaction become visible to another transaction whenever the autonomous transaction commits. Th

Effects of null for multiple assignments - sql, Effects of NULL for Multipl... Effects of NULL for Multiple Assignments - SQL If the row expression given as the source for a multiple assignment evaluates to NULL, then NULL is assigned to each target. If

Use the nocopy compiler hint - performance of application, Use the NOCOPY C... Use the NOCOPY Compiler Hint By default, the OUT and IN OUT parameters are passed by the value i.e. the value of an IN OUT actual parameter is copied into the corresponding fo

Components of an object type - parameter self, Parameter SELF in pl/sql ... Parameter SELF in pl/sql The MEMBER methods recognize a built-in parameter named SELF that is an instance of the object type. Whether declared explicitly or implicitly, it is

Semidifference and not - sql, Semidifference and NOT - SQL In this sec... Semidifference and NOT - SQL In this section first describe the relational difference operator, named MINUS. Example here shows SQL's closest counterpart of that operator.