Read an entity relationship diagram
The information you need is sometimes split across multiple tables in the database.
What is the most common stackoverflow tag_type? What companies have a tag of that type?
To generate a list of such companies, you'll need to join three tables together.
Reference the entity relationship diagram as needed when determining which columns to use when joining tables.
Latihan ini adalah bagian dari kursus
Exploratory Data Analysis in SQL
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
-- Count the number of tags with each type
SELECT ___, ___ AS count
FROM ___
-- To get the count for each type, what do you need to do?
___ ___ ___
-- Order the results with the most common tag types listed first
___ ___ ___ ___;