Let’s recap what data types we’ve covered so far:
- Boolean.
TRUE
or FALSE
- Text.
text
values like emails, names, countries etc - Numeric.
integer
numbers like 1, 2, 99 or float
1.123, 129.33333 - Date. Datetime, Interval for dealing with dates, timestamps and time intervals
NULL
. No value
All these data types have one thing in common – they hold a single value.
Holding single value is great – it is easy to understand, easy to maintain. It’s a perfect choice for a column which will always have data (for example: email or book title). The price we pay...
Sign up and check out 36 free lessons and exercises.
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. 