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  3. Introduction to Databases in Python

Exercise

Correlated updates

You can also update records with data from a select statement. This is called a correlated update. It works by defining a select statement that returns the value you want to update the record with and assigning that select statement as the value in update.

You'll be using a flat_census in this exercise as the target of your correlated update. The flat_census table is a summarized copy of your census table, and contains, in particular, the fips_state columns.

Instructions

100 XP
  • Build a statement to select the name column from state_fact. Save the statement as fips_stmt.
  • Append a where clause to fips_stmt that matches fips_state from the state_fact table with fips_code in the flat_census table.
  • Build an update statement to set the state_name in flat_census to fips_stmt. Save the statement as update_stmt.
  • Hit 'Submit Answer' to execute update_stmt, store the results and print the rowcount of results.