This folder includes code and data used in [chapter 4 of PostgreSQL: Up and Running, 4th Edition](https://www.oreilly.com/library/view/postgresql-up-and/9798341660885/ch04.html)

* The folder *ACSST1Y2024.S2502* was exported from link [Census Tract Housing Demographics 2023](https://data.census.gov/table?q=S2502:+Demographic+Characteristics+for+Occupied+Housing+Units&t=Housing&g=010XX00US$1400000&y=2023) , [Census Tract Housing Demographics 2022](https://data.census.gov/table?q=S2502:+Demographic+Characteristics+for+Occupied+Housing+Units&t=Housing&g=010XX00US$1400000&y=2022), [Census Tract Housing Demographics 2020](https://data.census.gov/table?q=S2502:+Demographic+Characteristics+for+Occupied+Housing+Units&t=Housing&g=010XX00US$1400000&y=2020)