SQL - UNPIVOT

Question

Hello All,
I'm trying to get unpivot and pivot to work and can't quite wrap my head around it.
I created a test table which contains DAY, TYPE, DB_ID. In short the backup schedule for a database instance.
Here is my SQL and output.
select b.day_abbrev, c.bck_type_abbrev
from ori_bck_schedules a
left join ori_days b on b.day_id = a.day_id
left join ori_bck_types c on c.bck_type_id = a.bck_type_id
left join ori_databases d on d.database_id = a.database_id
where a.database_id = 369;
DAY_ABBREV BCK_TYPE_ABBREV
SUN        FULL           
MON        INCR           
TUE        INCR           
WED        INCR           
THU        INCR           
FRI        INCR           
SAT        FULL            I would like to unpivot this table to get 1 rows showing the day of the weekend and the type of backup? And I ultimately would like to have 1 row showing the day of the week and then just rows showing the DB_ID.
Here is what I mean:
            SUN     MON  TUE    WED 
DB1      FULL    FULL   INCR
DB2      INCR    INCR   FULL
DB3 ......The below code is not working for me.
select b.day_abbrev as "day", c.bck_type_abbrev as "type"
from ori_bck_schedules a
left join ori_days b on b.day_id = a.day_id
left join ori_bck_types c on c.bck_type_id = a.bck_type_id
left join ori_databases d on d.database_id = a.database_id
unpivot (a for day_abbrev in (b.day_abbrev as 'D',c. bck_type_abbrev as 'T'))
ORA-01748: only simple column names allowed here
01748. 00000 -  "only simple column names allowed here"
*Cause:   
*Action:
Error at Line: 45 Column: 31Can anybody help? Thanks in advance for any assistance
Jan

Answer 1

try like this. if you are on 11g
SQL> WITH T
  2       AS (SELECT 1 ID, TO_CHAR ( (SYSDATE - 6) + LEVEL, 'DY') day_of_week, 10 * LEVEL expense
  3             FROM DUAL
  4           CONNECT BY LEVEL <= 7)
  5  SELECT *
  6    FROM T;
        ID DAY    EXPENSE
         1 SUN         10
         1 MON         20
         1 TUE         30
         1 WED         40
         1 THU         50
         1 FRI         60
         1 SAT         70
7 rows selected.
SQL> WITH T
  2       AS (SELECT 1 ID, TO_CHAR ( (SYSDATE - 6) + LEVEL, 'DY') day_of_week, 10 * LEVEL expense
  3             FROM DUAL
  4           CONNECT BY LEVEL <= 7)
  5  SELECT *
  6    FROM T PIVOT (MAX (expense)
  7           FOR day_of_week
  8           IN ('SUN', 'MON', 'TUE', 'WED', 'THU', 'FRI', 'SAT'));
        ID      'SUN'      'MON'      'TUE'      'WED'      'THU'      'FRI'      'SAT'
         1         10         20         30         40         50         60         70
SQL> on 10g
SQL> WITH T
  2       AS (SELECT 1 ID, TO_CHAR ( (SYSDATE - 6) + LEVEL, 'DY') day_of_week, 10 * LEVEL expense
  3             FROM DUAL
  4           CONNECT BY LEVEL <= 7)
  5  SELECT ID,
  6         MAX (DECODE (day_of_week, 'SUN', expense)) AS sun,
  7         MAX (DECODE (day_of_week, 'MON', expense)) AS mon,
  8         MAX (DECODE (day_of_week, 'TUE', expense)) AS tue,
  9         MAX (DECODE (day_of_week, 'WED', expense)) AS wed,
10         MAX (DECODE (day_of_week, 'THU', expense)) AS thu,
11         MAX (DECODE (day_of_week, 'FRI', expense)) AS fri,
12         MAX (DECODE (day_of_week, 'SAT', expense)) AS sat
13    FROM T
14  GROUP BY ID;
        ID        SUN        MON        TUE        WED        THU        FRI        SAT
         1         10         20         30         40         50         60         70
SQL> G.