Would it be possible to construct SQL to concatenate column values from multiple rows?
The following is an example:
PID A B C
PID SEQ Desc A 1 Have A 2 a nice A 3 day. B 1 Nice Work. C 1 Yes C 2 we can C 3 do C 4 this work!
Output of the SQL should be -
PID Desc A Have a nice day. B Nice Work. C Yes we can do this work!
So basically the Desc column for out put table is a concatenation of the SEQ values from Table B?
Any help with the SQL?
There are a few ways depending on what version you have - see the oracle documentation on string aggregation techniques. A very common one is to use
SELECT pid, LISTAGG(Desc, ' ') WITHIN GROUP (ORDER BY seq) AS desc FROM B GROUP BY pid;
Then join to
A to pick out the
pids you want.
Note: Out of the box,
LISTAGG only works correctly with