- 1. Table Transformation
- SELECT * FROM flights WHERE (SELECT code FROM airports WHERE elevation < 2000);
- Nested subqueries
- First get all the codes from airports table if its elevation is smaller than 2000
- Use this as a filter to query all columns of data from the flights table
- Don't forget the ; semicolon in the end
Thursday, January 12, 2017
Codecademy SQL Table Transformation Subqueries Walkthrough
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