isabella232 / sql-notes

My personal notes I made to learn SQL

SQL-Essentials

What is SQL?

• SQL stands for Structured Query Language.
• SQL is a standard language for storing, manipulating and retrieving data in databases.
• SQL is NOT case sensitive, so SELECT is the same as select.

What can SQL do?

• Execute queries against a database
• Retrieve data from a database
• Insert records in a database
• Update records in a database
• Delete records from a database
• Create new databases
• Create new tables in a database
• Create stored procedures in a database
• Create views in a database
• Set permissions on tables, procedures, and views

Requirements

We will be using Northwind database to practice our SQL skills through SQLite. The Northwind database consists of 12 tables with a lot of fields (column) and hundreds of records (rows) that we can use for query.

!pip install ipython-sql

ipython-sql introduces a %sql(for single-line command) or %%sql(for multiple-line commands) magic to our Jupyter notebook allowing us to connect to a database, using SQLAlchemy connect strings, then issue SQL commands within iPython or iPython Notebook.

Load Extension

%load_ext sql

Connect to Database

%sql sqlite:///northwind.db

Summary of the Database

Work in progress... 🙂