text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
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so we could update it there. | 3,800.69 | 3.23 |
But somehow, we need to cascade it over
to the [? artists ?] [INAUDIBLE] now | 3,803.92 | 4.92 |
this unidentified [? artist ?]
[? through-- ?] I think we probably | 3,808.84 | 3.54 |
don't need it. | 3,812.38 | 0.727 |
SPEAKER 1: Yeah, so a good point here. | 3,813.107 | 1.583 |
We could actually probably change the
created table to [? re-associate ?] | 3,814.69 | 4.56 |
an artist with some new artwork here. | 3,819.25 | 2.5 |
So let's visualize this. | 3,821.75 | 1.13 |
I go to my created table. | 3,822.88 | 1.66 |
And here the artist_id is currently
3, but I want it really to be 1. | 3,824.54 | 6.47 |
I want Li Yin to be associated with this
piece called "Farmers working at dawn." | 3,831.01 | 4.86 |
So I could update the created table
to instead of having 3 here have 1. | 3,835.87 | 5.73 |
Now, we see Li Yin created "Farmers
working at dawn." [? And if ?] | 3,841.6 | 4.62 |
you're concerned about this
Unidentified artist here, | 3,846.22 | 2.61 |
I think it's OK to have
an artist in our table | 3,848.83 | 2.55 |
who may or may not have
an item in collections. | 3,851.38 | 2.97 |
We'll say that's OK at least for now. | 3,854.35 | 2.89 |
So if we can update our associations
between artists and collections | 3,857.24 | 5.03 |
like this, let's actually try to do
that in our very own database here. | 3,862.27 | 4.5 |
I'll go back to my SQLite environment,
and now, let me try to open it first. | 3,866.77 | 6.24 |
I'll use sqlite3 mfa.db. | 3,873.01 | 2.55 |
And now let me type .schema to show you
[INAUDIBLE] the very same schema from | 3,875.56 | 3.9 |
before. | 3,879.46 | 0.79 |
So I want to update the artists
association between Li Yin and "Farmers | 3,880.25 | 5.09 |
working at dawn." | 3,885.34 | 1.23 |
So let's say, I'll SELECT [? star ?]
FROM "created," like this, semicolon. | 3,886.57 | 4.8 |
Here, I have my artist_ids
and my collection_ids. | 3,891.37 | 4.62 |
I see that we have the
Unidentified artist, id of 3, | 3,895.99 | 4.35 |
creating "Farmers working at dawn,"
with the id of 1 in our collection here. | 3,900.34 | 5.35 |
So now, let's try to update the artist
who created this particular painting. | 3,905.69 | 5.48 |
Here, I have 3 associated with 1,
but I want 1 associated with 1, | 3,911.17 | 5.49 |
where 1 is the id for Li Yin. | 3,916.66 | 1.92 |
And [? 1 ?] [? in ?] my collection
id is the id for this artwork here. | 3,918.58 | 4.278 |
So let me try this. | 3,922.858 | 0.792 |
I'll say UPDATE "created" and
SET, let's say, "artist_id" | 3,923.65 | 5.97 |
equal to some particular value. | 3,929.62 | 3.15 |
Well, what value should I set it to? | 3,932.77 | 2.88 |
I could try to set it to Li Yin's
id, which we know is just 1. | 3,935.65 | 4.29 |
But let me try instead to
use a [? subquery ?] here. | 3,939.94 | 3.36 |
Let me try to say parentheses, and then
write some query to update this value. | 3,943.3 | 5.82 |
I'll say SELECT "id" from
"artists" like this Enter again, | 3,949.12 | 6.18 |
WHERE the "name" equals Li Yin. | 3,955.3 | 4.89 |
And then let me close
this [? subquery. ?] Well, | 3,960.19 | 3.9 |
if I try to run this query, what might
Happen I'm updating the created table, | 3,964.09 | 6.42 |
I'm setting the artist_id equal to the
id for Li Yin, but what I've forgotten | 3,970.51 | 6.09 |
is this WHERE to only
choose some rows to update. | 3,976.6 | 4.92 |
[INAUDIBLE] not close it yet. | 3,981.52 | 1.68 |
I'll instead say WHERE, in this
case, the "collection_id," the piece | 3,983.2 | 5.94 |
of artwork in our collection,
is equal to [? while ?] the id | 3,989.14 | 4.98 |
for this painting. | 3,994.12 | 1.21 |
I'll say SELECT "id" from
"collections," and then I'll | 3,995.33 | 3.77 |
say WHERE the "title" equals
"Farmers working at dawn." | 3,999.1 | 6.61 |
Now, I'll close this
[? subquery, ?] and hit semicolon. | 4,005.71 | 3.99 |
And here, we've seen our first
example of an UPDATE query. | 4,009.7 | 3.9 |
I'm trying to update
the artist_id column | 4,013.6 | 2.91 |
in created to be the id for Li Yin. | 4,016.51 | 3.48 |
I only want to do that
though on the row where | 4,019.99 | 3.06 |
collection_id is equal to the
id for this particular painting. | 4,023.05 | 4.41 |
[INAUDIBLE] change the attribution for. | 4,027.46 | 2.01 |
So now, I'll hit Enter. | 4,029.47 | 1.89 |
And if I SELECT
[? star ?] FROM "created," | 4,031.36 | 3.01 |
I should hopefully see in this
case that the artist_id associated | 4,034.37 | 5.9 |
with this painting is 2 and also
down below here is 1 as well. | 4,040.27 | 5.41 |
So I have Li Yin associated
with now two paintings overall. | 4,045.68 | 5.61 |
So let's get a grasp on what
this [? UPDATE ?] syntax really | 4,051.29 | 3.47 |
looks like in general. | 4,054.76 | 1.38 |
And for that, let's show the slide here. | 4,056.14 | 2.58 |
We have this [? UPDATE ?] [? keyword, ?]
[? UPDATE ?] statement in SQL to take | 4,058.72 | 5.37 |
a table name and update
the columns inside of it. | 4,064.09 | 3.42 |
I say UPDATE, then the name
of the table I want to update, | 4,067.51 | 3.9 |
then I say SET some column
equal to some value. | 4,071.41 | 5.4 |
I could if I wanted to have
more than one column here. | 4,076.81 | 3.1 |
I could say maybe title
and even maybe if we're | 4,079.91 | 3.71 |
talking about authors, authors
over here, or even acquired date. | 4,083.62 | 3.42 |
I could update more than one column
in my [? SET ?] [? portion ?] here. | 4,087.04 | 4.89 |
Then comes this WHERE portion,
where some condition is true. | 4,091.93 | 4.44 |
I want to make sure I don't
update all of my rows. | 4,096.37 | 3.6 |
I only update those where some
condition is actually true. | 4,099.97 | 4.3 |
So this is your syntax
for updating some columns. | 4,104.27 | 3.799 |
Let's say, if you want to
change an artist's attribution | 4,108.069 | 2.79 |
or if you want to change
a typo you've made. | 4,110.859 | 4.091 |
So let's see this now, not
just in terms of changing | 4,114.95 | 3.86 |
artists and their attributions,
let's see a use case for update | 4,118.81 | 3.584 |
where we've made some
mistakes in our data. | 4,122.394 | 2.906 |
And let's say the museum decides
to host some kind of event | 4,125.3 | 4.309 |
where people vote on their
favorite piece of artwork, | 4,129.609 | 2.551 |
they kind of [? handwrite ?] or
type it into some online form. | 4,132.16 | 2.76 |
Well, when I get back, a
CSV of those responses, | 4,134.92 | 3.09 |
some Comma Separated Values, one
line for each vote from our people | 4,138.01 | 4.59 |
who've attended this convention. | 4,142.6 | 2.04 |
Let's go back over here,
and I'll show you that CSV. | 4,144.64 | 3.839 |
Let me go to my environment. | 4,148.479 | 2.581 |
And I'll type code mfa.csv to
open this CSV that I already have. | 4,151.06 | 5.879 |
And here, actually,
it's not called mfa.csv. | 4,156.939 | 2.491 |
It's called code votes.csv. | 4,159.43 | 3 |
And now here we can see, I
have a table of one column | 4,162.43 | 5.46 |
that has several votes inside of it. | 4,167.89 | 1.98 |
Let's see, we have maybe
20 votes to be exact. | 4,169.87 | 3.27 |
So the first row is the header row. | 4,173.14 | 2.7 |
I have in this CSV, one
column called title. | 4,175.84 | 3.809 |
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