A list can be rendered using the v-for directive. The syntax requires that you specify the source array to iterate on, and an alias that will be used to reference each item in the iteration. In the following example we use items as the source array, and item as the alias for each item.
HTML
<di...
Common table expressions support extracting portions of larger queries. For example:
WITH sales AS (
SELECT
orders.ordered_at,
orders.user_id,
SUM(orders.amount) AS total
FROM orders
GROUP BY orders.ordered_at, orders.user_id
)
SELECT
sales.ordered_at,
sales.total,...
When creating Random instances with the same seed, the same numbers will be generated.
int seed = 5;
for (int i = 0; i < 2; i++)
{
Console.WriteLine("Random instance " + i);
Random rnd = new Random(seed);
for (int j = 0; j < 5; j++)
{
Console.Write(rnd.Next(...
The main methods that are useful with this class are popleft and appendleft
from collections import deque
d = deque([1, 2, 3])
p = d.popleft() # p = 1, d = deque([2, 3])
d.appendleft(5) # d = deque([5, 2, 3])
There are three visibility types that you can apply to methods (class/object functions) and properties (class/object variables) within a class, which provide access control for the method or property to which they are applied.
You can read extensively about these in the PHP Documentation for OOP Vi...
Uses a partition criteria to group the row numbering according to it.
SELECT
ROW_NUMBER() OVER(PARTITION BY DepartmentId ORDER BY DepartmentId ASC) AS RowNumber,
DepartmentId, Fname, LName
FROM Employees
This query selects all employees not on the Supervisors table.
SELECT *
FROM Employees
WHERE EmployeeID not in (SELECT EmployeeID
FROM Supervisors)
The same results can be achieved using a LEFT JOIN.
SELECT *
FROM Employees AS e
LEFT JOIN Supervisors AS s ON s.E...
The procedure describes how to add an Object library reference, and afterwards how to declare new variables with reference to the new library class objects.
The example below shows how to add the PowerPoint library to the existing VB Project.
As can be seen, currently the PowerPoint Object library...
Double-quoted strings use interpolation and escaping – unlike single-quoted strings. To double-quote a string, use either double quotes " or the qq operator.
my $greeting = "Hello!\n";
print $greeting;
# => Hello! (followed by a linefeed)
my $bush = "They misunderestimat...
In Haskell, data types can have arguments just like functions. Take the Maybe type for example.
Maybe is a very useful type which allows us to represent the idea of failure, or the possiblity thereof. In other words, if there is a possibility that a computation will fail, we use the Maybe type ther...
We have a sample Spring boot application which stores user data in MongoDB and we are using Rest services to retrieve data
First there is a domain class i.e. POJO
@Document
public class User{
@Id
private String id;
private String name;
}
A corresponding repository based on ...
The publisher-subscriber is a familiar concept given the rise of YouTube, Facebook and other social media services. The basic concept is that there is a Publisher who generates content and a Subscriber who consumes content. Whenever the Publisher generates content, each Subscriber is notified. Subsc...
To support a given application, you often create a new role and database to match.
The shell commands to run would be these:
$ createuser -P blogger
Enter password for the new role: ********
Enter it again: ********
$ createdb -O blogger blogger
This assumes that pg_hba.conf has been prope...
Table file with header, footer, row names, and index column:
file: table.txt
This is a header that discusses the table file
to show space in a generic table file
index name occupation
1 Alice Salesman
2 Bob Engineer
3 Charlie Janitor
This is a footer becaus...
Introduction
The BufferedReader class is a wrapper for other Reader classes that serves two main purposes:
A BufferedReader provides buffering for the wrapped Reader. This allows an application to read characters one at a time without undue I/O overheads.
A BufferedReader provides functi...
In C, a string is a sequence of characters that is terminated by a null character ('\0').
We can create strings using string literals, which are sequences of characters surrounded by double quotation marks; for example, take the string literal "hello world". String literals are automatica...
In the Project.pro file we add :
CONFIG += sql
in MainWindow.h we write :
#include <QMainWindow>
#include <QSql>
#include <QDebug>
namespace Ui
{
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWid...
In the Project.pro file we add : CONFIG += sql
in MainWindow.h we write :
#include <QMainWindow>
#include <QSql>
#include <QDebug>
namespace Ui
{
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget...
