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What is object identity?
An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
Relational and E-R Model There are three types of constraints on relational database that have: DOMAIN CONSTRAINT PRIMARY KEY CONSTRAINT INTEGRITY CONSTRAINT
Define Database layer? The database layer defines the data formats used in the database.
What is the most significant feature that does not directly map into programming language structures? Why? Association, since there are complex types of association, like as qu
The result of the UNION operation between R1 and R2 is a relation that includes? The result of the operation between R1 and R2 includes all the tuples of R1 and R2 which have c
Two Phase Locking (2PL) The two-phase locking protocol having of two phases: Phase 1 : The lock acquisition phase : If a transaction T needs to read an object, it wants to
Explain outer join? Outer Join - If there are any values in one table which do not have corresponding value(s) in the other, in an equi-join which will not be chosen. Such ro
Explain cursors in SQL? Cursors in SQL - An object used to store the output of a query for row-through-row processing through the application programs. Cursors are constructs
Section A: Use the following tables to create a database called College. Use SQL commands. Student stuid(primary) lastName firstName
What are axioms? Axioms or rules of inference give a simpler technique for reasoning about
Using Literal Character String Example: To print IS A as one string with column name employee SELECT ENAME || ' IS A ' || JOB AS "EMPLOYEE" FROM EMP;
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