SQL, how to use SELECT
New Course Coming Soon:
Get Really Good at Git
How to get data from a SQL database table
You can get data out of tables using the SELECT
command.
Get all rows and columns:
SELECT * FROM people;
age | name
-----+--------
37 | Flavio
8 | Roger
Get only the name
column:
SELECT name FROM people;
name
--------
Flavio
Roger
Count the items in the table:
SELECT COUNT(*) from people;
count
-------
2
You can filter rows in a table adding the WHERE
clause:
SELECT age FROM people WHERE name='Flavio';
age
-----
37
The results of a query can be ordered by column value, ascending (the default) or descending, using ORDER BY:
SELECT * FROM people ORDER BY name;
SELECT * FROM people ORDER BY name DESC;
Are you intimidated by Git? Can’t figure out merge vs
rebase? Are you afraid of screwing up something any time
you have to do something in Git? Do you rely on ChatGPT
or random people’s answer on StackOverflow to fix your
problems? Your coworkers are tired of explaining Git to
you all the time? Git is something we all need to use,
but few of us really master it. I created this course to
improve your Git (and GitHub) knowledge at a radical
level. A course that helps you feel less frustrated with
Git. Launching Summer 2024. Join the waiting list!
→ Read my
SQL Tutorial
on The Valley of Code
Here is how can I help you:
- COURSES where I teach everything I know
- THE VALLEY OF CODE your web development manual
- BOOTCAMP 2024 cohort in progress, next edition in 2025
- BOOKS 16 coding ebooks you can download for free on JS Python C PHP and lots more
- SOLO LAB everything I know about running a lifestyle business as a solopreneur
- Interesting links collection
- Follow me on X