Resources for O'Reilly "SQL Fundamentals for Data" online training
Recommended SQLite Environments:
SQLiteOnline http://sqliteonline.com/
SQLiteStudio https://sqlitestudio.pl/features/
OTHER RESOURCES:
O'Reilly Interactive Code Modules
Resources for O'Reilly "SQL Fundamentals for Data" online training
Resources for O'Reilly "SQL Fundamentals for Data" online training
Recommended SQLite Environments:
SQLiteOnline http://sqliteonline.com/
SQLiteStudio https://sqlitestudio.pl/features/
OTHER RESOURCES:
O'Reilly Interactive Code Modules
I'm looking at examples from the notes and I've come across this sql snippet:
SELECT year, month, count(*) as record_count
FROM station_data
WHERE tornado = 1
GROUP BY year, month
I've realized that count(*) as record count
is not really required in this example which can be shortened to
SELECT year, month FROM station_data
WHERE tornado = 1
GROUP BY year, month;
so could you please explain what the aggregation above does or why is it needed? Is it to count the number of records of each distinct type?
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