Question PostgreSQL Python Compose the code required to implement an aggregate function, usually expressed in SQL through use of the "GROUP BY" statement. #! /usr/bin/env python An example python...

Extracted text: Question PostgreSQL Python Compose the code required to implement an aggregate function, usually expressed in SQL through use of the "GROUP BY" statement. #! /usr/bin/env python An example python script to illustrate how a projection might be simulated, and lead to an example GROUP BY (using dictionaries to group and aggregate) """