Titlebook: Leveling Up with SQL; Advanced Techniques Mark Simon Book 2023 Mark Simon 2023 database.PostgreSQL.Oracle.MySQL.MariaDB.SQLite.SQL

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https://doi.org/10.1007/978-1-4842-9685-1database; PostgreSQL; Oracle; MySQL; MariaDB; SQLite; SQL

落葉劑

Getting Ready,If you’re reading this book, you’ll already know some SQL, either through previous study or through bitter experience, or, more likely, a little of both. In the process, there may be a few bits that you’ve missed, or forgotten, or couldn’t see the point.

Ballad

Working with Table Design,SQL databases are, or at least should be, built on some pretty strong principles. Although these principles are sometimes relaxed in real life, the database will be more reliable and more efficient if they’re followed as far as possible.

Jogging

Table Relationships and Joins,A database is not just one table. Well, it can be of course, but any sophisticated database, such as one which you would use to manage an online bookshop, will comprise a number of tables, each handling a different collection of data.

Jocose

Working with Calculated Data,No doubt, you will have seen calculations before now. SQL allows you to include calculated data in your queries.

Comedienne

Aggregating Data,Databases store data. That’s obvious, but the data itself is pretty inert—you save it, you retrieve it, and you sometimes change it. That’s OK for some things, but sometimes you want the data to work a little harder.

一起

Using Views and Friends,You can spend the rest of your life writing SQL statements, and the job would get done. However, you might get to the point where writing the same thing over and over again loses its charm, and so you’ll want to find ways of reusing previous queries.

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