Count the categories
In this chapter, we'll be working mostly with the Evanston 311 data in table evanston311. This is data on help requests submitted to the city of Evanston, IL.
This data has several character columns. Start by examining the most frequent values in some of these columns to get familiar with the common categories.
Latihan ini adalah bagian dari kursus
Exploratory Data Analysis in SQL
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
-- Select the count of each level of priority
SELECT ___, ___
___ ___
___ ___;