Tutorial by Topics: ble

The knapsack problem or rucksack problem is a problem in combinatorial optimization. Given a set of items, each with a weight and a value, determine the number of each item to include in a collection so that the total weight is less than or equal to a given limit and the total value is as large a...

In the example above, a reference field (SupID) can be used to indicate the ID of that employee's supervisor. Using something as simple as a DLOOKUP can return the name of that supervisor. eg. DLOOKUP("Name","EmployeeTable", "ID = " & SupID) Another good ex...

A Hash Table is a structure which maps keys to values. See Hash Table for details. An important concept which relies on Hash Tables is Splatting. It is very useful for making a large number of calls with repetitive parameters.

When using async callback we need to consider scope. Especially if inside a loop. This simple article shows what not to do and a simple working example.

In this topic I would like to mention all possible global variables which can be used in Apex code. Like [UserInfo Class][1]. I suggest we just list a global classes/variables and links. If you know about a global class/variable but can't find a documentation, please provide as much informati...

As the name implies, vector drawables are based on vector graphics. Vector graphics are a way of describing graphical elements using geometric shapes. This lets you create a drawable based on an XML vector graphic. Now there is no need to design different size image for mdpi, hdpi, xhdpi and etc. W...

When you receive an error: "Microsoft Access has encountered a problem and needs to close", there is often not a lot of information to help you identify the cause of the error. Below are a series of steps you can take to troubleshoot the cause of the errors. Be sure to remove other vari...

A UIRefreshControl object provides a standard control that can be used to initiate the refreshing of a table view’s contents. You link a refresh control to a table through an associated table view controller object. The table view controller handles the work of adding the control to the table’s visu...

Previous versions of Raspbian (prior to November 2016) had SSH enabled by default. They also had a default username (pi) and password (raspberry) this was done to make first time setup for new users easier. But this obviously represents a large security hole. The new release (November 2016) disables...

Conditional variables are useful in cases where you want a thread to wait for something that happens in another thread. For instance, in a producer/consumer scenario with one or or more producing threads and one consuming thread, conditional variables can be used to signal the consuming thread that ...

Topic "Automatic Variables" already has 7 examples listed and we can't add more. This topic will have a continuation of Automatic Variables. Automatic Variables are variables that store state information for PowerShell. These variables are created and maintained by Windows PowerShell. ...

From Adminer management tool it's has export to csv file option for mysql database But not available for postgresql database. Here I will show the command to export CSV for postgresql database.

OpenStack is an open-source software platform for cloud computing. Linux instances can be launched/stopped manualy using the graphical web interface or automated thanks to ansible's openstack cloud module. Configuring ansible can be tricky, but once well configured using it is really easy and power...

This topic describe how to add and style tables

PowerShell offers a variety of useful "automatic" (built-in) variables. Certain automatic variables are only populated in special circumstances, while others are available globally.

Pivot table is one kind of interactive table, which can be used to calculate data, such as get sum or count data. Also, users can change pivot table layout for analyzing data with different ways or reassign row/column label. Every time users change layout, data will be recalculated in pivot table. ...

Example of how to copy existing table structure with/without data CREATE TABLE schemaName.table AS (SELECT columns FROM schemaName.table) WITH DATA