Polymorphism:Polymorphism means taking many forms, where ‘poly’ means many and 'morph' means forms. Polymorphism allows you define one interface or method and have multiple implementations. In Java, there are two types of polymorphism: compile time polymorphism and run time polymorphism. Compile ti...
(<materialize>(/* select#2 */ select `test`.`t2`.`a` from `test`.`t2` where 1 having 1 ),<primary_index_lookup>(`test`.`t1`.`a` in<temporarytable>on<auto_key>where ((`test`.`t1`.`a` = `materialized-subquery`.`a`))) AS `t1.a IN (SELECT t2.a FROM t2)` from `te...
For example, when the SQL statement contains bind variables the plan shown from using EXPLAIN PLAN ignores the bind variable values while the plan shown in V$SQL_PLAN takes the bind variable values into account in the plan generation process. It is easy to display an execution plan using the...
Assume that n and digit are int variables. a) switch (n = 2) case 0: cout "Draw." end1; break; case 1: cout "Wi How does HashMap work in Java? (a) How do we overload a method in java? (b) Give an example. What are the characteristics of the C programming language?
Access to the registry key 'HKEY_CLASSES_ROOT\name of the class' is denied. access variable from another function Access Variables in Different Projects in a Solution Accessibility of parent's class fields from child class Accessing a dictionary from another class Accessing a server which require...
Action: Re-phrase the query to avoid the use of correlated variables or outer joins. QSM-02057 ROWNUM referenced in materialized view Cause: The capability in question is not supported when the materialized view references the ROWNUM function. Action: Re-phrase the query to avoid the use of ...
The static method can be directly called on the class instead of the class object. But still the variables declared inside the method are local variables which reside on the stack. If it would have been a class level static variable then it would have been visible in method2(). So your ...
An interface is a way of describing what classes should do, without specifying how they should do it. A class can implement more than one interface. In Java, an interface is not a class but a set of requirements for the class that we want to conform to t
Typecasting is amethod in C language of converting one data type to another. There are two types of typecasting. 1. Implicit Type casting − This conversion is done by the compiler. When more than one data type of variables are used in an expression, the compiler converts data types to...
While this sounds simple, it can be nontrivial in some programming languages where you need to explicitly import a library that contains the print function (for instance, in C you need to begin with #include <stdio.h>) or do complicated things with classes and variables (see the Java "...