oracle sql convert all rows to columns - oracle11g

Question

I want to flip all rows to columns. So if have following 5 columns
with 3 data rows
ACCT_ID NAME PHONE MOBILE ALTERNATIVE_NAME
01 JOE BROWN 0456-9992-6666 07767828432 ZOE BROWN
02 GILL SHARP 0456-9992-6666 07763928432 BILL SHARP
03 ZAC LOWE 0236-9992-5644 07663925672 LUKE LOWE
I want the result set to look as follows. So have 3 columns and 5 rows.
COL headings (COL1 - COL3) are only added to make clearer, i don't need
columns headings
COL1 COL2 COL3
01 02 03
JOE BROWN GILL SHARP ZAC LOWE
0456-9992-6666 0456-9992-6666 0236-9992-5644
07767828432 07763928432 07663925672
ZOE BROWN BILL SHARP LUKE LOWE
I tried using PIVOT on one column (acct_id)
Select *
from
(
select ACCT_ID
from TABLE
)
pivot
(
max(ACCT_ID) as ACCT_ID
for ACCT_ID in ('01','02','03')
)
This returns following
'01'_ACCT_ID '02'_ACCT_ID '03'_ACCT_ID
01 02 03
Which is on the right track. Just need extending to include the other 4 columns (NAME,PHONE,MOBILE,ALTERNATIVE_CONTACT), listed under the associated acct_id.
So end up with 5 rows.
Can anyone help.

Answer 1

You could brute-force it with a series of case expressions:
select max(case when acct_id = '01' then acct_id end) as col1,
max(case when acct_id = '02' then acct_id end) as col2,
max(case when acct_id = '03' then acct_id end) as col3
from your_table
union all
select max(case when acct_id = '01' then name end),
max(case when acct_id = '02' then name end),
max(case when acct_id = '03' then name end)
from your_table
union all
select max(case when acct_id = '01' then phone end),
max(case when acct_id = '02' then phone end),
max(case when acct_id = '03' then phone end)
from your_table
... repeat for other columns
COL1 COL2 COL3
-------------- -------------- --------------
01 02 03
JOE BROWN GILL SHARP ZAC LOWE
0456-9992-6666 0456-9992-6666 0236-9992-5644
...
Or you could unpivot and re-pivot, which is messy and probably doing more work than is really necessary:
select col1, col2, col3
from (
select t.*, t.acct_id as col_id
from your_table t
)
unpivot
(
value for heading in (acct_id, name, phone, mobile, alternative_name)
)
pivot
(
max(value) for col_id in ('01' as col1, '02' as col2, '03' as col3)
)
order by case heading when 'ACCT_ID' then 1 when 'NAME' then 2 when 'PHOEN' then 3
when 'MOBILE' then 4 when 'ALTERNATIVE_NAME' then 5 end
COL1 COL2 COL3
-------------- -------------- --------------
01 02 03
JOE BROWN GILL SHARP ZAC LOWE
07767828432 07763928432 07663925672
ZOE BROWN BILL SHARP LUKE LOWE
0456-9992-6666 0456-9992-6666 0236-9992-5644
The subquery to add the dummy col_id expression is only there so you can picot on the acct_id and also include it in the result.
If you want to include the original column names as a heading column in the final result, add that to the first select list:
select heading, col1, col2, col3
from (
...
This only works if you know there will be (at most) three rows (and is based on fixed account IDs, though that is fixable); if you don't know how many columns your final result will need to have then you need to look at dynamic SQL.