Tutorial by Topics: value

One thing to note - types that have a non-nil zero value like strings, ints, floats, bools and structs can't be set to nil.

To build a dynamic and interactive PHP program, it is useful to output variables and their values. The PHP language allows for multiple methods of value output. This topic covers the standard methods of printing a value in PHP and where these methods can be used. Variables in PHP come in a var...

WITH CTE_name (column_name[,...]) AS ( SELECT column_name[,...] FROM base_table UNION ALL SELECT column_name[,...] FROM CTE_name WHERE <recursion limiting condition> ) SELECT column_name[,...] FROM CTE_name

Entity Stores information about the type of the data being stored. In the case of Magento this is customer, product, category, etc. Attribute The individual properties of each of the entities, e.g. name, weight, email address etc. Value The value of a given entity and attribute. For example, ...

How to get the desired formatting of DateTime and Numeric values.

A column is NULL when it has no value, regardless of the data type of that column. A column should never be compared to NULL using this syntax a = NULL as the result would be UNKNOWN. Instead use a IS NULL or a IS NOT NULL conditions. NULL is not equal to NULL. To compare two expressions where null...

At certain points, you will be evaluating a range of data and you will need to locate the duplicates in it. For bigger data sets, there are a number of approaches you can take that use either VBA code or conditional functions. This example uses a simple if-then condition within two nested for-next l...

A customization of the Android RangeSeekBar proposed by Alex Florescu at https://github.com/anothem/android-range-seek-bar It allows to define a step value (increment), when moving the seek bar 1- Add the increment attribute in attrs.xml <attr name="increment" format="integ...

MySQL 5.7.8+ supports native JSON type. While you have different ways to create json objects, you can access and read members in different ways, too. Main function is JSON_EXTRACT, hence -> and ->> operators are more friendly. JSON_EXTRACT(json_doc,path[,...]) JSON_EXTRACT(json_doc,...

Boxes are a very important part of Rust, and every rustacean should know what they are and how to use them

The scope of this section is to explain the differences in theory and implementation for what happens with the parameters of a function upon calling. In detail the parameters can be seen as variables before the function call and inside the function, where the visible behaviour and accessibility to ...

Here is a way of having multiple value inside of a selector in order to filter a grid.

reactive, reactiveValue and eventReactive are various kinds of reactive expressions in Shiny. They yield output which can be used as input in other expressions, which will in turn take a dependency on the reactive expression. observe and observeEvent are similar to reactive expressions. The big dif...

This technique should be used whenever you have boundaries defined into a spec. It is a great idea to apply it to any rule based on time, values, any kind of counting or scale to be triggered. It also ensure and helps finding n + 1 errors. And yes, it is an expansion from Equivalence Partition c...