Stage 1 · Lesson 7 of 8
Loading a sample database
Practise on realistic data from day one by loading a well-known . Use pagila or dvdrental for , sakila or world for MySQL, and AdventureWorks or WideWorldImporters for . These have dozens of related tables and thousands of .
They also include NULLs (missing values) and awkward cases that tiny practice tables hide. Loading one teaches a real skill too: running a script and a data script, or restoring a backup file. Spend twenty minutes exploring before you write queries. List the tables, look at their columns, and sketch how the main tables relate.
Common trappractising only on five-row tables you typed yourself, where every query looks correct and nothing is slow.
A question to check yourself, an AI practice session and 2 cheat sheet entries come with the full roadmap. Unlock
Resources for this stage
Start with· follow one of these
- CourseFreeCS50's Introduction to Databases with SQL
Harvard University · Beginner
Watch Lecture 0 (Querying) for the relational model; it uses SQLite, and the ideas carry straight across
- CourseFreeQuery and modify data with Transact-SQL
Microsoft · Beginner
Start with the Introduction to Transact-SQL module; it sets up a sample database in the browser or locally