Question

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Is there an Oracle SQL query that aggregates multiple rows into one row?

I’m trying to to create a SQL query that can return data from a table to display multiple values of a column in one row.

For example this is the table setup:

SEQ   ROWSEQNUM   ASSISTING_ASSOCIATES  
100   2           19332816  
100   1           1366344  
103   1           12228238  
104   1           1366474 

I need to query results to look like this:

 SEQ   ROWSEQNUM   ASSISTING_ASSOCIATES  
 100   1           1366344; 19332816  
 103   1           12228238  
 104   1           1366474 

Does anybody have any insight?

Answer 1

I think this ought to work, assuming that for each SEQ value there is always a row with ROWSEQNUM=1 and the values for ROWSEQNUM increase sequentially with no gaps.

select seq, min(rowseqnum), max(assoc_list)
from (
  select seq, rowseqnum, sys_connect_by_path(assisting_associate,';') assoc_list
    from assoc_table
    start with rowseqnum=1
    connect by seq = prior seq and rowseqnum = prior rowseqnum + 1
  )
group by seq