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  3. Data Manipulation in SQL

Ejercicio

Add a subquery in FROM

In the previous exercise, you created a data set listing the average home and away goals in each match stage of the 2012/2013 match season.

In this next step, you will turn the main query into a subquery to extract a list of stages where the average home goals in a stage is higher than the overall average for home goals in a match.

Instrucciones

100 XP
  • Calculate the average home goals and average away goals from the match table for each stage in the FROM clause subquery.
  • Add a subquery to the WHERE clause that calculates the overall average home goals.
  • Filter the main query for stages where the average home goals is higher than the overall average.
  • Select the stage and avg_goals columns from the s subquery into the main query.