Effective PyCharm Transcripts
Lecture: Modifying the DB schema
0:00 You just have to modify data. What if we want to modify the structure of the table itself.
0:06 So we can come over here and actually work on these various things, we come over and say I'd like to modify the column and that will let us
0:12 actually work on the last updated column. But generally you want to work at I guess at least the table level.
0:19 So we'll come over here. It's a modified table and let's give it some room Here. You can see all of the columns that if I click on one I
0:28 could do things like remove it here and so on. You can see the keys, the indexes and the foreign keys there are known for
0:35 this table. We come over here and I could actually add one. I could say what we're gonna do is we're going to have a column called rating
0:42 that's going to be an integer and it's a default value is 3. How cool is that? Look at what is below though here is the actual SQL
0:53 DDL script that you need to run to make this change and I think that that is fantastic because these are the kinds of things I always forget.
1:02 What's the altar table thing for changing the column name. If there's data there. You know, things like that get really complicated.
1:10 Now I could push this button and it will happen directly or I could actually pull
1:14 this down and just stay open in the editor like so and I'm not really sure that I want to run this yet.
1:22 So here it is in the editor and I could decide or I could do some sort of transaction or I could match up a bunch of them so if we come
1:28 over here highlight that and we run it got some output here and notice we ran this and it completed. That looks pretty good.
1:38 You don't see it already did refresh. I was thinking it wouldn't refresh. There we go. Well here's our rating that we created so we could come over
1:45 and run this again and now we should have our rating in here somewhere. Perfect. You see now all of our entries have a rating and their default value
1:57 of three. Super cool. Huh? All right so let's go ahead and take that away again. We can come up we'll modify and then just hit the minus.
2:07 Gonna do a whole bunch of work to safely remove that and then put everything back like it was. But notice right there our rating is now gone again.
2:15 So if you need to modify the structure of one of these tables well there's a really cool way to do it.
2:20 Just go here do it in the editor and then hit save. Either generate a DDL.
2:25 Transformation script like we did the first time or just hit execute and make it happen right away.