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Examples of tabular database how to#
Examples of tabular database pdf#
Examples of tabular database software#
Examples of tabular database code#

In a one-to-one relationship, a record in one table can correspond to only one record in another table (or in some cases, no records). Giving some thought to how your tables should relate to each other also helps ensure data integrity, data accuracy, and keeps redundant data to a minimum. Those relationships between your tables can be: This process often involves creating a visual representation of tables and their relationships, known an entity relationship diagram (ERD), with different notations specifying the kinds of relationships. Identifying the connections you’ll need between tables is part of the data modeling and schema design process - that is, the process of figuring out how your data fits together, and how exactly you should configure your tables and their fields.

When one table’s entity key gets linked to a second table, it’s known as a foreign key in that second table. By telling your database that the key values in one table correspond to key values in another, you create a relationship between those tables these relationships make it possible to run powerful queries across different tables in your database. Every table contains a field known as an entity (or primary) key, which identifies the rows within that table. Without some connection between tables in a database, you may as well be working with disparate spreadsheet files rather than a database system.Īs we covered in our short overview of databases, databases are collections of tables, and those tables have fields (also known as columns).

Examples of tabular database how to#

In this tutorial, we have introduced you to the chinook SQLite sample database and showed you how to connect to it using the sqlite3 tool.Relationships are meaningful associations between tables that contain related information - they’re what make databases useful.

Examples of tabular database code#

tablesĬustomers invoice_items playlist_track Code language: SQL (Structured Query Language) ( sql ) tables to view all the tables available in the sample database. You should see the following command: sqlite> Code language: Shell Session ( shell ) c:\sqlite>sqlite3 c:\sqlite\db\chinook.db Code language: Shell Session ( shell ) Second, use the following command to connect to the chinook sample database located in the db folder, which is a subfolder of the sqlite folder.

Examples of tabular database software#

If you don’t have zip software installed, you can download a free zip software such as 7-zip.įirst, use the command line program and navigate to the SQLite directory where the sqlite3.exe file is located: c:\sqlite> Code language: Shell Session ( shell ) The sample database file is ZIP format, therefore, you need to extract it to a folder, for example, C:\sqlite\db.

Examples of tabular database pdf#

In case you want to have the database diagram for reference, you can download both black&white and color versions in PDF format.ĭownload SQLite sample database diagram with color How to connect to SQLite sample database You can download the SQLite sample database using the following link. The playlist_track table is used to reflect this relationship. The relationship between the playlists table and tracks table is many-to-many. Each track may belong to multiple playlists.

playlists & playlist_track tables: playlists table store data about playlists.

tracks table stores the data of songs.

genres table stores music types such as rock, jazz, metal, etc.

media_types table stores media types such as MPEG audio and AAC audio files.

However, one artist may have multiple albums.

albums table stores data about a list of tracks.

It is a simple table that contains only the artist id and name. The invoices table stores invoice header data and the invoice_items table stores the invoice line items data.

invoices & invoice_items tables: these two tables store invoice data.

It also has a field named ReportsTo to specify who reports to whom.

employees table stores employees data such as employee id, last name, first name, etc.

There are 11 tables in the chinook sample database.

The following database diagram illustrates the chinook database tables and their relationships. We provide you with the SQLite sample database named chinook. The chinook sample database is a good database for practicing with SQL, especially SQLite. Introduction to chinook SQLite sample database At the end of the tutorial, we will show you how to connect to the sample database using the sqlite3 tool. Then, we will give you the links to download the sample database and its diagram. Summary: in this tutorial, we first introduce you to an SQLite sample database.