Group items tagged

Use quotes to search for phrases.

Force Google to include search terms.

intext:”San Antonio” intext:Alamo

It forces Google to show results with the phrase “San Antonio” and the word Alamo. You won’t get results that are missing either search term.

Minus does not equal plus.

“Control F” is your friend

Limit the time frame.

Use this keyboard shortcut to find a word or phrase on any web page. I

Mark-up:   Marked information is data that has marks or signals to let a computer distinguish one type of data from the other.  

A variable:   A variable happens when you give some data a name. 

A string:   A string is a kind of variable that has text.

An array:   An array is a type of variable that includes a list used by computer programs for later manipulation.    

An object:   Explaining objects in full requires that someone read up on object-oriented programming.  

Tree-based  Structures Tree-based structures, or cluster models are a subset of “structured text” data storage models.  

XML is probably the best example.

data is organized in “parents”, “siblings” and “children”.

The Relational Model The relational model is better than a tree-model when your dataset is large and complicated.    The way it works is, instead of thinking in terms of “parents, siblings and children,” you think in term of relationships.

the “Primary Key.”   This means that every data object (such as a library) has a way of identifying itself in a unique way

a “Foreign Key.”    The Foreign key is a way to associate one dataset (eg. libraries) with another dataset (eg. library branches, hospitals or businesses).

This association is called a relationship.

In more complicated relationships (called the Many-to-Many relationship), you might have to create a third table to associate two entities.      

TEXT/XML Based Text files can be organized in such a way as to accommodate some of the benefits of the relational model.

Two examples of XML-based databases include Xindice and Sedna.

SQL/Binary-based Databases The more common relational database type is a piece of software running on a server, rather than a set of text files.   They are generally accessed using a standard language called SQL (Structure Query Language), or more specifically SQL as supported by a popular scripting language like PHP, Python or Java.

Almost any major web application will have a combination of all these types of data storage methods!