SQL at work SQL at work recap

254. SQL at work recap

I hope that when you’re reading this you already have database access at work and have written your first query! 🙏

Let’s recap the tips & tricks we’ve seen in this chapter:

Commenting filters in queries

Prepending the 1 = 1 filter (which is always equals to TRUE and doesn’t affect query results) allows us to comment out any filter in the query without worrying about hanging AND operators:

SELECT * FROM users WHERE 1 = 1 AND country = 'us' AND status = 'customer' 


We’ve talked about 4 aspects of SQL style guide:

  1. Naming. It’s really...
“well worth the money”
Sign up and check out 36 free lessons and exercises.

Anatoli Makarevich, author of SQL Habit About SQL Habit

Hi, it’s Anatoli, the author of SQL Habit. 👋

SQL Habit is a course (or, as some of the students say, “business simulator”). It’s based on a story of a fictional startup called Bindle. You’ll play a role of their Data Analyst 📊 and solve real-life challenges from Business, Marketing, and Product Management.

SQL Habit course is made of bite-sized lessons (you’re looking at one atm) and exercises. They always have a real-life setting and detailed explanations. You can immediately apply everything you’ve learned at work. 🚀

“well worth the money”

Fluent in SQL in a month

Master Data Analysis with SQL with real life examples from Product Management, Marketing, Finance and more.
-- Type your query here, for example this one -- lists all records from users table: SELECT * FROM users
Loading chart... ⏳