Sqlitestudio query examples
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If not, select it from the options below.įollow the download prompts. The correct version for your operating system should appear at the top. Now that you know the basics, we’re going to jump right in and start building a database.įirst, you need to download SQLiteStudio, the database manager we’ll be using for this tutorial. SQLite also has a command-line utility, but since this tutorial is an introduction, we’ll be using SQLiteStudio. There are a couple options for SQLite GUI database mangers, including SQuirreL SQL Client and SQLiteStudio. The database holds your data, but you need a client to see and interact with it. db files that you can store anywhere on your computer. The databases you work with in SQLite exist in. SQLite is a little different from other implementations of SQL because it operates on regular plain old local files and does not require a server connection, unlike PostgreSQL and MySQL. We’re going to use SQLite in this tutorial because getting set up requires less work. Different implementations (such as PostgreSQL and MySQL) have their own higher level specialized functions, but the all handle the same basic operations covered in this tutorial. There are different implementations of SQL-one implementation is SQLite. SQL (Structured Query Language) is a programming language for interacting with data in a relational database. In a relational database, the data is contained in different tables. There are different kinds of databases-one kind is a relational database. If you don’t have a chance to check out Keith’s post, here are the short answers to a couple questions that you may be asking yourself: What is a database?Ī database is a collection of data that is structured to allow for manipulation. Before continuing here, I highly recommend reading Keith’s post Databases for Smart People Who Are Scared of Databases for a helpful conceptual overview of the what and why of databases. This tutorial is based on the recent SQL workshop hosted by the Digital Fellows, and is designed to get you started using relational databases. The following statement creates the contacts table.Image by Willow Brugh (database skillshare relational), via Wikimedia Commons The Basics
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The following database diagram illustrates tables: contacts groups, and contact_groups.
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The contacts table that stores contact information.In addition, each contact belongs to one or many groups, and each group can have zero or many contacts.īased on these requirements, we came up with three tables: The requirement is that the email and phone must be unique. Suppose you have to manage contacts using SQLite.Įach contact has the following information: Note that the primary key of a table is a column or a group of columns that uniquely identify each row in the table. Note that the WITHOUT ROWID option is only available in SQLite 3.8.2 or later. A table that contains the rowid column is known as a rowid table. If you don’t want SQLite creates the rowid column, you specify the WITHOUT ROWID option. The rowid column stores a 64-bit signed integer key that uniquely identifies the row inside the table. By default, a row in a table has an implicit column, which is referred to as the rowid, oid or _rowid_ column. Finally, optionally use the WITHOUT ROWID option.Fifth, specify the table constraints such as PRIMARY KEY, FOREIGN KEY, UNIQUE, and CHECK constraints.SQLite supports PRIMARY KEY, UNIQUE, NOT NULL, and CHECK column constraints. Each column has a name, data type, and the column constraint. Fourth, specify the column list of the table.The schema can be the main database, temp database or any attached database. Third, optionally specify the schema_name to which the new table belongs.Attempting to create a table that already exists without using the IF NOT EXISTS option will result in an error. Second, use IF NOT EXISTS option to create a new table if it does not exist.The name of the table cannot start with sqlite_ because it is reserved for the internal use of SQLite. First, specify the name of the table that you want to create after the CREATE TABLE keywords.
#Sqlitestudio query examples code#
) Code language: SQL (Structured Query Language) ( sql )