Working with aggregate functions
If a table contains data with higher granularity than is needed for an analysis, it can make sense to summarize the data with SQL aggregate functions before importing it. For example, if you have data of flood event counts by month but precipitation data by day, you may decide to SUM precipitation by month.
The weather table contains daily readings for four months. In this exercise, you'll practice summarizing weather by month with the MAX, MIN, and SUM functions.
pandas has been loaded as pd, and a database engine, engine, has been created.
Deze oefening maakt deel uit van de cursus
Streamlined Data Ingestion with pandas
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
# Create a query to get month and max tmax by month
query = """
SELECT ____,
____
FROM ____
____ ____;"""
# Get dataframe of monthly weather stats
weather_by_month = pd.read_sql(query, engine)
# View weather stats by month
print(weather_by_month)