![]() And there's nothing wrong with doing this when we don't have access to a computer.īut while it's easy to pick out the common and different names, it won't be when the lists are thousands or millions of rows each. This is how we would compare two lists on paper, for example. Looking from the left-to-right to make comparisons – this is the old-fashioned, non-computational – but perfectly common sense – way of making comparisons. Putting them side-by-side is much easier than flipping through different tabs/windows: name The easiest way to imagine this is taking two separate tables and smashing them together, so that they're side-by-side.īelow are two baby name tables, one from 1980 and the other from 2014. The purpose of a JOIN query is to bring together two tables. The next lesson looks at LEFT JOINs – which share the same syntax but give us the ability to find when things are missing from tables. This lesson focuses on the overall syntax of joins and the most common type of join: INNER JOIN. SQLite is capable of creating in-memory databases that are very fast to work with.For the data journalist, joins are the feature that completely justify the jump from spreadsheets to databases.Ī JOIN is done through yet another clause of a SELECT statement – and so expect things to get even more cluttered. This brings many nice features like joining tables in different databases or copying data between databases in a single command. ![]() SQLite allows a single database connection to access multiple database files simultaneously. It means you can store any value in any column, regardless of the data type. ![]() In other words, all changes within a transaction take place completely or not at all even when an unexpected situation like application crash, power failure, or operating system crash occurs. It means all queries and changes are Atomic, Consistent, Isolated, and Durable. TransactionalĪll transactions in SQLite are fully ACID-compliant. In addition, SQLite does not use any configuration files. There is no server process that needs to be configured, started, and stopped. Zero-configurationīecause of the serverless architecture, you don’t need to “install” SQLite before using it. If you want to develop an application that uses SQLite, you just need to drop these files into your project and compile it with your code. The source code is available as a big sqlite3.c and its header file sqlite3.h. This makes SQLite usable in any environment especially in embedded devices like iPhones, Android phones, game consoles, handheld media players, etc. SQLite is self-contained means it requires minimal support from the operating system or external library. The following diagram illustrates the SQLite server-less architecture: Self-Contained The applications interact with the SQLite database read and write directly from the database files stored on disk. SQLite database is integrated with the application that accesses the database. The following diagram illustrates the RDBMS client/server architecture: This is called client/server architecture. The applications that want to access the database server use TCP/IP protocol to send and receive requests. Normally, an RDBMS such as MySQL, PostgreSQL, etc., requires a separate server process to operate. SQLite has the following noticeable features: self-contained, serverless, zero-configuration, transactional. The lite in SQLite means lightweight in terms of setup, database administration, and required resources. SQLite is a software library that provides a relational database management system. Summary: This tutorial gives you a brief overview of SQLite and the SQLite’s distinctive features that make SQLite the most widely deployed SQL database engine.
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