Aggregate Query Problem

Question

I have a partioned table containing 2002 data with the following format:
TAGNAME NOT NULL VARCHAR2(15)
DATA_TYPE NOT NULL CHAR(1)
DATA_DATE NOT NULL DATE
QUALITY CHAR(1)
AVERAGE NUMBER(22,6)
MINIMUM NUMBER(22,6)
MINTIME DATE
MAXIMUM NUMBER(22,6)
MAXTIME DATE
TOTAL NUMBER(22,6)
MINUTES_ON NUMBER(11)
MINUTES_OFF NUMBER(11)
MOTOR_STARTS NUMBER(11)
MOTOR_STOPS NUMBER(11)
CERTIFIED CHAR(1)
I need to build a query that will bring back the max(total) and min(total) and the dates they occurred for month-to-date and year-to-date. I have tried including the value in a subquery, but it fails on "group function not allowed here." I also need to keep the date to one returned value in the event that more than one date exists with the min/max value.
An example of one I tried just getting the min value and date returned for the year (the partition):
SELECT min(sd.total) as "Minimum",
(SELECT data_date
FROM sd_table
WHERE total = min(sd.total)
and tagname = sd.tagname
and rownum = 1) as "MaxDate"
FROM sd_table sd
SQL> /
(SELECT data_date FROM sh_table WHERE total = min(a.total)
ERROR at line 2:
ORA-00934: group function is not allowed here
Any suggestions??
Thanks.

Answer 1

Correction:
The examples that I gave above would have been for the last year or 365 days and the last month or 30 days. The following corrected version is for the current year and the current month up until today's date, which is what I think you mean by year-to-date and month-to-date.
scott@ORA92> -- test data
scott@ORA92> SELECT total, data_date FROM sd_table
  2  /
     TOTAL DATA_DATE
         3 03-APR-04
        20 24-APR-04
         1 24-APR-04
         3 02-APR-04
         4 01-APR-04
         2 03-FEB-04
        10 24-JAN-04
7 rows selected.
scott@ORA92> COLUMN min_or_max FORMAT A10
scott@ORA92> SELECT 'Year-to-date' AS period,
  2           'Minimum'        AS min_or_max,
  3           total,
  4           data_date
  5  FROM   (SELECT total, data_date,
  6                ROW_NUMBER () OVER (ORDER BY total ASC, data_date DESC) AS rk
  7            FROM   sd_table
  8            WHERE  data_date BETWEEN TRUNC (SYSDATE, 'YYYY') AND SYSDATE)
  9  WHERE  rk = 1
10  UNION ALL
11  SELECT 'Month-to-date' AS period,
12           'Minimum'         AS min_or_max,
13           total,
14           data_date
15  FROM   (SELECT total, data_date,
16                ROW_NUMBER () OVER (ORDER BY total ASC, data_date DESC) AS rk
17            FROM   sd_table
18            WHERE  data_date BETWEEN TRUNC (SYSDATE, 'MM') AND SYSDATE)
19  WHERE  rk = 1
20  UNION ALL
21  SELECT 'Year-to-date' AS period,
22           'Maximum'        AS min_or_max,
23           total,
24           data_date
25  FROM   (SELECT total, data_date,
26                ROW_NUMBER () OVER (ORDER BY total DESC, data_date DESC) AS rk
27            FROM   sd_table
28            WHERE  data_date BETWEEN TRUNC (SYSDATE, 'YYYY') AND SYSDATE)
29  WHERE  rk = 1
30  UNION ALL
31  SELECT 'Month-to-date' AS period,
32           'Maximum'         AS min_or_max,
33           total,
34           data_date
35  FROM   (SELECT total, data_date,
36                ROW_NUMBER () OVER (ORDER BY total DESC, data_date DESC) AS rk
37            FROM   sd_table
38            WHERE  data_date BETWEEN TRUNC (SYSDATE, 'MM') AND SYSDATE)
39  WHERE  rk = 1
40  /
PERIOD        MIN_OR_MAX      TOTAL DATA_DATE
Year-to-date  Minimum             2 03-FEB-04
Month-to-date Minimum             3 03-APR-04
Year-to-date  Maximum            10 24-JAN-04
Month-to-date Maximum             4 01-APR-04
scott@ORA92> SELECT year_min.total     AS ytd_min,
  2           year_min.data_date AS y_mindate,
  3           mon_min.total      AS mtd_min,
  4           mon_min.data_date  AS m_mindate,
  5           year_max.total     AS ytd_max,
  6           year_max.data_date AS y_maxdate,
  7           mon_max.total      AS mtd_max,
  8           mon_max.data_date  AS m_maxdate
  9  FROM   (SELECT total, data_date
10            FROM   (SELECT total, data_date,
11                     ROW_NUMBER () OVER (ORDER BY total ASC, data_date DESC) AS rk
12                 FROM   sd_table
13                 WHERE  data_date BETWEEN TRUNC (SYSDATE, 'YYYY') AND SYSDATE)
14            WHERE  rk = 1) year_min,
15           (SELECT total, data_date
16            FROM   (SELECT total, data_date,
17                     ROW_NUMBER () OVER (ORDER BY total ASC, data_date DESC) AS rk
18                 FROM   sd_table
19                 WHERE  data_date BETWEEN TRUNC (SYSDATE, 'MM') AND SYSDATE)
20            WHERE  rk = 1) mon_min,
21           (SELECT total, data_date
22            FROM   (SELECT total, data_date,
23                     ROW_NUMBER () OVER (ORDER BY total DESC, data_date DESC) AS rk
24                 FROM   sd_table
25                 WHERE  data_date BETWEEN TRUNC (SYSDATE, 'YYYY') AND SYSDATE)
26            WHERE  rk = 1) year_max,
27           (SELECT total, data_date
28            FROM   (SELECT total, data_date,
29                     ROW_NUMBER () OVER (ORDER BY total DESC, data_date DESC) AS rk
30                 FROM   sd_table
31                 WHERE  data_date BETWEEN TRUNC (SYSDATE, 'MM') AND SYSDATE)
32            WHERE  rk = 1) mon_max
33  /
   YTD_MIN Y_MINDATE    MTD_MIN M_MINDATE    YTD_MAX Y_MAXDATE    MTD_MAX M_MAXDATE
         2 03-FEB-04          3 03-APR-04         10 24-JAN-04          4 01-APR-04