使用sql分组多个字段

Question

After doing some joins and stuff I have table in the following format

name    session_id   status  time
abc         1          10
xyz         2          11 
jack        2          10
zuck        1          10 
paul        1          10 

Now I want my results to be grouped like this

session_id   name+status                   time
1            abc:10, zuck:10, paul:10
2            xyz:11, jack:11             

and the result set to be sorted by time, I'm little confused how to achieve this using group by

Answer 1

if your db is oracle, you can try. Afer oracle 11g r2, you can also use listagg

select session_id, wm_concat(name_status), time from 
(
  select session_id, (name+':'+status) as name_status, time
  from stuff
)
group by session_id
order by time

Answer 2

SELECT
    session_id
  , GROUP_CONCAT( CONCAT(name, ':', COALESCE(status, -1) 
                  SEPARATOR ', '
                  ORDER BY `time`
                )  AS name_status
  , MIN(`time`)    AS min_time     --- or MAX(`time`)
FROM 
    TableX
GROUP BY
    session_id
ORDER BY
    min_time                    

You could use time instead of MIN(time) , if all rows with same session_id have same time (if time is functionally dependent on session_id ). If that's not the case and you use time , you'll not get consistent results on that column.