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Joining Data with SQL

Here you can access every table used in the course. To access each table, you will need to specify the world schema in your queries (e.g., world.countries for the countries table, and world.languages for the languages table).

Note: When using sample databases such as those that contain course data, you have read-only access. You can run queries, but cannot make any changes such as adding, deleting, or modifying the data (e.g., creating tables, views, etc.).

Take Notes

Add notes about the concepts you've learned and SQL cells with queries you want to keep.

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DataFrameas
world_info
variable
-- Add your own queries here
SELECT *
FROM world.languages 
LIMIT 5


SELECT region, AVG(gdp_percapita) AS avg_gdp
FROM countries AS c
LEFT JOIN economies AS e
USING(code)
WHERE year = 2010
GROUP BY region
-- Order by descending avg_gdp
ORDER BY avg_gdp DESC
-- Return only first 10 records
LIMIT 10;