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Optimize SQL query to select countries with GDP exceeding Europe's maximum #2

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Optimize SQL query to select countries with GDP exceeding Europe's maximum #2

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15 changes: 8 additions & 7 deletions sqlzoo/BiggerThanEurope.sql
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Original file line number Diff line number Diff line change
@@ -1,7 +1,8 @@
SELECT name
FROM world
WHERE gdp >
(SELECT
MAX(gdp)
FROM world
WHERE continent LIKE 'Europe')
SELECT w.name
FROM world w
JOIN (
SELECT MAX(w2.gdp) AS max_gdp
FROM world w2
WHERE w2.continent = 'Europe'
) europe_max
ON w.gdp > europe_max.max_gdp;