Using this table:
| Area | Address | Price |
|---|---|---|
| Downtown | 72 Easy Street | 509000 |
| Downtown | 29 Right Way | 402000 |
| Downtown | 45 Diamond Lane | 203000 |
| Downtown | 76 Blind Alley | 201000 |
| Downtown | 15 Tern Pike | 199000 |
| Downtown | 444 Kanga Road | 102000 |
| Uptown | 15 Peak Street | 456000 |
| Uptown | 27 Primrose Path | 349000 |
| Uptown | 44 Shady Lane | 341000 |
| Uptown | 34 Design Road | 244000 |
| Uptown | 2331 Highway 64 | 244000 |
| Uptown | 77 Sunset Strip | 102000 |
the following SQL statement returns a computed result after doing linear interpolation, as the following tables shows.
SELECT area,
AVG(price),
PERCENTILE_DISC(0.5) WITHIN GROUP (ORDER BY price),
PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY price)
FROM market
GROUP BY area;
| Area | Average Price | PERC_DISC | PERC_CONT |
|---|---|---|---|
| Downtown | 269333 | 201000 | 202000 |
| Uptown | 289333 | 244000 | 292500 |