Answer / Mukesh Kumar Sinha

A primary key in Oracle is a column or set of columns that uniquely identifies each record in a table. It enforces the rule that no two records can have the same value for the primary key columns. To create a primary key, the CREATE TABLE statement includes the PRIMARY KEY keyword followed by the column name(s). For example: "CREATE TABLE Employees ( Employee_ID PRIMARY KEY, First_Name VARCHAR2(20), Last_Name VARCHAR2(25));"

What is the O/P of the below Code Snippet ? And how does it imply the concept of call-by-value/call-by-reference. (Note : Pls ignore syntx errors) public class One { sop ("Into One--"); } public class Two extends One{ sop ("Into Two--"); } public class Home { One a; Two t; public static void main(argv[]) { sop ("In Home--"); sop(One.a); sop(Two.a); sop(One.t); sop(Two.t); } }

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