用于收缩行的简单 SQL 语句

Question

I have a simple table that is grouped by the INTERVAL column. Each INTERVAL has three corresponding rows, and each row has one value that corresponds to the average of some type of weight losses while the other types of weight losses are NULL . I would like to put all three types of weight losses into one row. Is there any simple way to achieve this?

Here is the original table that I have:

Here is the table that I want it to look like:

 ---------------------------------------------------------------
| INTERVAL | AVG los MANAGED | AVG los NPIC | AVG los UNMANAGED |
 ---------------------------------------------------------------
|1000-1249 | 54.627118644067 | 52.485833333 | 46.379746835443   |
 ---------------------------------------------------------------
|1250-1499 | 39.734567901234 | 36.705544933 | 33.1023622047244  |
 ---------------------------------------------------------------
| ...      | ...             | ...          | ...               |
 ---------------------------------------------------------------

Answer 1

select `INTERVAL`, max(`AVG los MANAGED`), max(`AVG los NPIC`), max(`AVG los UNMANAGED`)
from your_table
group by `INTERVAL` 

Answer 2

Just aggregate by interval and take the max of each column:

SELECT
    "INTERVAL",
    MAX("AVG los MANAGED")   AS "MAX los MANAGED",
    MAX("AVG los NPIC")      AS "AVG los NPIC",
    MAX("AVG los UNMANAGED") AS "AVG los UNMANAGED"
FROM yourTable
GROUP BY
    "INTERVAL";