What Means Database

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What does it mean database:

Think this story:

You are a business man, Your name is program (Your are the hand comes frol right side on picture)

database.jpg

Then Imagine the librarian girl, in left side, her name is Database.

If you need some data, tell her what you want. And she gives that with data format.

Her main work is writing notebooks. erasing and changing pages. but there is little problem; He is talking foreign language which is called SQL, so how do you communicate with her.

 

Guess what: You need to learn SQL language. If you know this language then you can give orders to her.

Orders like this:

  • Give me the book called "lessons"
  • Hey girl, please delete record six on "students"
  • Erase all pages about John Smith, because she left.

We call this order as "query"

 

And this senario changes when some other business man comes from window, His name is ASP.NET or C++. no matter.Who wants to tell something to librarian girl, they need to learn SQL language. Database workd like this.

in this picture, there can be another working people from this window. Like; C++(we call him big C.), Python (Guess why we call him snake) , ASP (Little brother of ASP.NET).

 

You can learn SQL language easily: because there is only 4 main words in this language.

  • SELECT (give data)
  • DELETE (erase)
  • UPDATE (change)
  • INSERT (write)

You need to learn little parameters after this main words.

is it look very hard ?

If you learn SQL. Then you can talk with librarian girl. she is lovely girl :)

Here is some example sentences and their meanings on SQL language.


DELETE FROM `lessons`

means: erase everything from lessons `notebook`



SELECT `name` FROM `users`

 

means: give me names from notebook named `users`


Source: Mysql Tutorials

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