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How does Oracle act as ODBC and give examples of front end uses with ODBC?
ODBC achieve portability at the level of the executable by introducing an extra level of indirection. All direct interaction with a specific DBMS happens through a DBMS- specific driver. A driver is a software program that translates the ODBC calls into DBMS- specific calls. Drivers are loaded dynamically on demand since the DBMSs the application is going to access are known only at run-time. Available drivers are registeredwith a driver manager. The Oracle database driver translates the SQL commands from the application into equivalent commands that the Oracle DBMS understands and takes the result from the DBMS and translate into equivalent form for the application.
Example: Let there be a DSN named EMPLOYEE through, which we want to access theOracle database in Visual Basic. Dim CN As New ADODB.Connection Dim RS As New ADODB.Recordset CN.Open "DSN=employee", "scott", "tiger"
Order by clause By using this rows can be sorted It is used in the last portion of select statement By default it gets ascending order DESC: is used
What are the responsibility of File manager? File Manager : Manager allocation of space on disk storage and the data structures used to represent within stored on disk. It is a
what benefit can a company gain by managing its own infrasture and services
What are the General Transformation Rules for Relational operations? Ans: The transformation rules transform one relational algebra expression to AN EQUIVALENT ONE 1. E
What is Information System?
Create a view emp_dep containing e_name and number of dependents from the tables employee and dependent of (i) CREATE VIEW emp_dept AS SELECT ename, COUNT(*) FROM employee, dep
Creating views with Read only option : In the view definition this option is used to make sure that no DML operations can be done on the view.
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
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State about the Activity Diagram Activity diagrams show flow from one activity to other. It is an ongoing non atomic execution within a state machine. Activity finally results
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