September 2017
Intermediate to advanced
240 pages
5h 57m
English
Content preview from Learn More Python 3 the Hard Way: The Next Step for New Python ProgrammersBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Exercise 43. SQL Administration
The word “administration” is overloaded in databases. It can mean “making sure a PostgreSQL server keeps running,” or it can mean “altering and migrating tables for new software deployments.” In this exercise I’m only covering how to do simple schema alterations and migrations. Managing a full database server is outside the scope of this book.
Destroying and Altering Tables
You’ve already encountered DROP TABLE as a way to get rid of a table you’ve created. I’m going to show you another way to use it and also how to add or remove columns from a table with ALTER TABLE.
ex12.sql
1 /* Only drop table if it exists. */ 2 DROP TABLE IF EXISTS person; 3 4 /* Create again to ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.