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Apprendre et maitriser SQL : Qu'est ce que le SQL ? | Grafikart.fr | YouTubeToText
YouTube Transcript: Apprendre et maitriser SQL : Qu'est ce que le SQL ?
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Video Summary
Summary
Core Theme
This training introduces SQL (Structured Query Language) as a fundamental tool for interacting with relational databases, essential for modern web development and data management.
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Hi and welcome to this new
training course dedicated today to
learning SQL. SQL is
short for Structures
Language, and it's a language that
allows you to query
relational databases. It's a widely
widely
used language and one of the
fundamentals you need to know for
web development. This leads us
to the question: what is a
relational database? A
relational database is
simply a system that saves
information in the form of a
two-dimensional array called tables or
relationships. Now, this might
seem a little complicated as a
definition, but it's something
you've probably already encountered if
you've worked with a spreadsheet. In
a spreadsheet, you save
information in the same way: you
see columns that represent the
types of fields you want to
save, and then you fill in the
information row by row. It's
exactly the same in a
a
relational database: you have tables, which, if
you will, represent a sheet of paper to a spreadsheet. It's a
calculation, but it's a table. In this
table, we'll see columns that
represent the different types of
data we want to save, and
finally, we'll have rows that
represent each of our
records. In a
spreadsheet, we can use our mouse
to select the columns we
want to modify, but in
a relational database, we'll
need to use a language to
interact with it, and that's where SQL
comes in. So, we might ask ourselves, what
's the point of a
relational database, and more
generally, when creating a website, the
problem is that if we want
dozens or hundreds of pages, we
're forced to create hundreds of
HTML pages. You can imagine that on a large
scale, that's not very practical. So, what
we're going to do is
save the data in
a database, and then when
the user requests a
particular page, we'll retrieve that data
using SQL and then
insert it into a page template. So,
if you go to a recipe website,
they'll typically... They say, "Ah, but the
Auxerre AJ (Association of Young Professionals) manages the title, the
recipe content, I retrieve the links to
the different ones too early, and bam, I generate
a page, and that's how you can
generate hundreds and hundreds
of pages." Another advantage of a
database is that an administrator can log in
to publish their
own recipes, and you no longer necessarily
need a developer's intervention
to update any content, which
is pretty good.
Now, you should know that SQL itself
is a standard; it's not
necessarily the name of a
particular database. So this standard will be
used by different
database management systems such as
MySQL, MariaDB,
SQL Server, SQLite, and many others.
Unfortunately, they are used in slightly
different ways. That is to
say, what I'm going to show you here
may have variations
depending on the type of database
you use, but if you
understand the generic and
general concepts of SQL, it will apply to almost
any system. So, in this
training... We'll be using it for a few
hours, starting with
SQLite because it's the
easiest to begin with. But everything
you learn will be fairly
common to other
database management systems. If there are any specific
features, I'll try to
explain them as clearly as possible.
The goal of this training is to
learn practical basics, so I won't necessarily
focus too much on theory.
theory.
I don't think the standard will be very relevant, and we'll
directly focus on giving you the
most practical and
frequently used SQL queries and language elements. We'll also talk about
modeling because
structuring a database inevitably leads to
organizational problems.
So I'll show you the tools
we can use to learn how to
model things. We'll look at some
structural elements that are
generally found when discussing
databases, such as
joins, relationships, and
that sort of thing. Finally, we'll discuss
advanced features that are
present in some
database management systems. So you'll have
chapters dedicated to... Regarding
databases, specifically the
prerequisites for this
training, you have none.
SQL isn't a
programming language; it's a
specific language that allows us
to query our database. There are no
algae-like algorithms, for example, that you need to
know about SQL. So you don't
even need to know about the CSA (French acronym for "Canadian Standards and Accounting Standards").
Therefore, you can follow this
training regardless of your level,
without necessarily having any prerequisites. With that said,
said,
I'll see you in the
first chapter. We'll try to
configure our environment a little
so we can start
typing our first SQL queries and
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