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Introduction
ST_Equals
Relationships Between Geometries
ST_Distance and ST_Dwithin
Spatial joins practice
20. Spatial joins - exercise 2
Summary

## Instruction

Nice job! Let's do one additional exercise of this kind.

## Exercise

For each district, find the average number of households with a single parent per census block. Show two columns: district name and the average. Sort the results by the average in descending order.

### Stuck? Here's a hint!

Use the AVG(...) function to find the average per census block.