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Course Notes: Intermediate SQL Server
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In the SQL cell below:
- Set the source to 'Course Databases' to query databases used in SQL courses.
 - Set the source to 'DataFrames and CSVs' to query this course's CSV files (if any) with SQL
 - Write SQL! Note that you cannot run queries that modify the database.
 
DataFrameas
df
variable
-- COALESCE is like a bunch of elif() statements