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And I'll see I have 33 distinct publishers.
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OK.
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So this just about brings us to the conclusion
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of all of these new SQL keywords here.
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We've seen so far that we have several here to use.
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But let's figure out how to actually exit this prompt.
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So you might it be in your SQLite prompt right now.
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If you want to leave it, you could also use this command, dot quit.
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Dot quit is not a SQL keyword.
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It's a SQLite keyword to leave your terminal
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and go back to where you started.
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So just to review then, what we've seen so far
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is how to select data from our table.
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We can use select column to take some column from our table
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and give us back all of those rows from that table for that column.
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We've seen we can apply some aggregate functions to take
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maybe the count of our columns or the average or so on.
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And we can get back not just all of our rows,
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but only some of them using our WHERE clause here along with a condition.
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We could have multiple conditions, having not just one but perhaps two.
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Like, let's say, here, condition 0 and condition 1.
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And we could also use, we saw before, this idea of equals and LIKE
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to match some pattern or to make something exactly equal over here.
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We could, again, use AND and OR.
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And we saw later on how we could order our data
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and use our LIMIT function to get back only some number of rows.
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Now, this then is our interaction to querying.
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And so far, we've seen this world of books.
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And the table we've had so far really just has books inside of it.
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But next time, what we'll see is how to take this world of books and split
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into multiple tables.
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How do we find information on publishers or books or authors too?
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And how do we try to put that in a table that
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can present the relationships among all of these different entities?
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We'll talk about all that and more when we come back next time.
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And we'll see you there.
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[Music]
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you
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okay welcome back everyone to web
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programming with Python and JavaScript
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and today we turn our attention to the
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second of the main programming languages
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that would be looking under this class
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in particular JavaScript and to get an
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understanding for why it is that
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JavaScript is actually helpful let's go
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back and revisit this diagram of what
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communication over the Internet will
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generally look like oftentimes we'll
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have a user otherwise known as the
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client using their computer on their web
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browser whether that's Chrome or Safari
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or some other web browser that sends an
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HTTP request a web request to some sort
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of web server that server then processes
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that request and then returns some sort
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of response that comes back to the
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client thus far all of the code that
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we've written the Python web application
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code running in a Django web application
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for example has all been code that runs
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on some sort of server code that is
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listening for requests doing some
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computation in order to process that
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request and then generating some sort of
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response usually in the form of an HTML
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template that we then send back to the
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client what JavaScript is going to
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enable us to do is to begin to write
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client-side code javascript is going to
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allow us to write code that actually
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runs and inside of the users web browser
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on the client and this can be useful for
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a number of reasons one if there's
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computation that we want to do but we
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don't need to go out and reach out to a
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server in order to do so we can do the
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computation potentially faster just by
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running the code exclusively on the
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client and in addition to that we can
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begin to make our web pages a whole lot
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more interactive javascript is going to
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give us the ability to directly
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manipulate the Dom where again the Dom
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is the document object model that tree
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like hierarchy that represents the web
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page that the user happens to be looking
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at so javascript will enable us to write
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code that directly manipulates the
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content on the web page and we'll see
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how that can be quite powerful very soon
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so how do we then use JavaScript inside
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of a web page in order to add some code
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add some programming logic to a web page
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well so far we've already seen HTML the
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language we use to describe the
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structure of a web page
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where a HTML page just describes the
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structure of a page and in terms of
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nested tags we had those head tags at
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