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JavaScript handling of the variable is different from other programming languages C, C++., Java, etc. Variables in JavaScript can be thought of as named containers. You can place data into these containers and then refer to the data simply by naming the container. Before you use a variable in a JavaScript program, you must declare it. Variables are declared with the var keyword as follows. var rank; var points; Storing a value in a variable is called variable initialization. You can do variable initialization at the time of variable creation or at a ... Read More
In SAP HANA, Persistence layer is used for handling all operational and transaction data to take secure backup and restoring data incase of corruption or database crash. It provides use of Save point which can be used for restoring data.With use of concept of persistence layer of SAP’s relational database, it ensures the successful data restores. Besides managing log data on the disk, HANA’s persistence layer allows read and write data operations via all storage interfaces.Persistence layer in HANA ensures that database can be restored to the most recent committed state after a restart or after a system crash and ... Read More
In Python 2.x, both != and operators are available to check if two operands are not equal. Both return true if operands are not equal and false if they are equal.In Python 3.x, operator has been deprecated.
By using DISTINCT keyword along with column name as the argument of COUNT() function we can count the number of unique values in a column. The syntax is as follows − SELECT COUNT(DISTINCT Col_name) FROM table_name; Example Suppose we have the following table mysql> Select * from tender; +----------+--------------+--------------+-------+ | clientid | client_Fname | Client_Lname | value | +----------+--------------+--------------+-------+ | 100 | Mohan | Kumar | 60000 | | 101 | Sohan ... Read More
The toString(Object[] a) method of the java.util.Arrays class returns a string representation of the contents of the specified Object array. If the array contains other arrays of elements, they are converted to strings by the Object.toString() method inherited from Object, which describes their identities rather than their contents. Example import java.util.Arrays; public class ArrayDemo { public static void main(String[] args) { Object[] ob1 = new Object[] { 10, 20 }; System.out.println("The array is:"); for (Object number ... Read More
Environment variable PATH should be set to point to where the Java binaries have been installed. Refer to your shell documentation if you have trouble doing this.Example, if you use bash as your shell, then you would add the following line to the end of your '.bashrc: export PATH=/path/to/java:$PATH'
Environment variable PATH should be set to point to where the Java binaries have been installed. Refer to your shell documentation if you have trouble doing this.Example, if you use bash as your shell, then you would add the following line to the end of your '.bashrc: export PATH=/path/to/java:$PATH'
In C++, a character in single quotes is a character literal. It's of type char. For example, 'a' is of type char with a value 97 on an ASCII based system.A character or a string of characters together in double quotes represent a string literal. It's of type const char[] and refers to an array of size length of string + 1. That extra character is there for marking the string's ending.String literals can be arbitrarily long, such as "abcdefg". Character literals almost always contain just a single character. When these are being printed, string literals are printed till the ... Read More
Suppose if we are calculating the sum of the values of a column which also have NULL values then MySQL SUM() function ignores the NULL values and does the sum of the rest of the values. To understand it, consider the following example of table ‘employee’, having following details − mysql> Select * from Employee; +----+--------+--------+ | ID | Name | Salary | +----+--------+--------+ | 1 | Gaurav | 50000 | | 2 | Rahul | 20000 | | 3 | Advik | 25000 | | 4 | ... Read More
Java supports single dimensional and multidimensional arrays. See the example below:Example Live Demopublic class Tester { public static void main(String[] args) { double[] myList = {1.9, 2.9, 3.4, 3.5}; // Print all the array elements for (double element: myList) { System.out.print(element + " "); } System.out.println(); int[][] multidimensionalArray = { {1,2},{2,3}, {3,4} }; for(int i = 0 ; i < 3 ; i++) { //row for(int j = 0 ; j < 2; j++) { System.out.print(multidimensionalArray[i][j] + " "); } System.out.println(); } } }Output1.9 2.9 3.4 3.5 1 2 2 3 3 4