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Consider employee (e_no, e_name, e_salary, d_code), dept(d_code, d_name) and dependent (depndt_name, e_no, relation). Show the names of employees in purchase and accounts departments with at least one dependent.
SELECT e_name FROM employee, dependent, dept WHERE employee.d_code=dept.d_code AND employee.e_no=dependant.e_no AND d_name IN (‘ACCOUNTS', ‘PURCHASE') GROUP BY e_name HAVING COUNT (e_no)>=1
Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1
Analyzing Association Traversal Association Traversal shall be understood properly for the association design explanation. Analyzing association traversal means analyzing tra
To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;
What is disadvantage of multiple inheritances? There is potential ambiguity if the similar variable or method can be inherited from more than one superclass.eg: student class m
What is Conceptual Schema? Conceptual Schema - Conceptual schema elaborates the structure of the overall database for a community of users. It hides the details of physical sto
Design a database for an airline.The database must keep track of customers and their reservations,flights and their status, seat assignment on individual flights and, the schedule
what is un ordered and ordered file managment?
A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation
What is Interaction Diagram An interaction diagram shows an interaction, comprises of a set of objects and their relationships including the messages that may be dispatched be
The database is to record information about artists for a (music) production company. An artist is the name of a singer or band; the name of the artist, the year the artist started
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