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Standard SQL Functions

Introduction
Simple CASE WHEN
Searched CASE WHEN
CASE WHEN with aggregates
17. CASE WHEN with COUNT – practice
CASE WHEN with GROUP BY
Summary

Instruction

Okay. Let's do one more exercise for this topic.

Exercise

Count the number of candidates who scored:

  • at least 80 in math (good_math).
  • at least 60 and less than 80 (average_math).
  • or less than 60 (poor_math).

Show only those candidates who have provided a preferred_contact form.

Stuck? Here's a hint!

One of the counts is as follows:

COUNT(CASE WHEN score_math >= 80 THEN id END)
AS good_math