Error in my group by function

Question

Hi,
I have 3 columns named share_id,high_value and shr_date in one table and shr_id in another table.
i join both the tables using shr_id
When i use the below query,
select a.shr_name,max(b.high)
from SHR_LIST a,SHR_QUOTES b
where a.shr_id = b.shr_id
group by a.shr_name
i get the expected result,
SHR_NAME HIGH_VALUE
ADITYA BIRLA CHEMICALS     99.9
SPICEJET     97.45
STATE BANK OF INDIA     999.8
i also need the which day the value was high,
eg: if SPICEJET's high was on 15th June 2012, I need to be displayed like below,
SHR_NAME HIGH_VALUE DATE
ADITYA BIRLA CHEMICALS     99.9          15th June 2012
SPICEJET     97.45          10th June 2012
STATE BANK OF INDIA     999.8     12th June 2012
i used the below query,
select a.shr_name,max(b.high),shr_date
from SHR_LIST a,SHR_QUOTES b
where a.shr_id = b.shr_id
group by a.shr_name,shr_date
But i am getting the output like,
SHR_NAME HIGH DATE
SPICEJET     9     21-JUL-00
SPICEJET     8.1     24-JUL-00
SPICEJET     8.1     25-JUL-00
SPICEJET     8.15     26-JUL-00
SPICEJET     7.8     27-JUL-00
SPICEJET     8     28-JUL-00
Please help me out...
I knew its very simple, but i lost somewhere.

Answer 1

/* Formatted on 2012/06/17 22:45 (Formatter Plus v4.8.8) */
WITH shr_list AS
     (SELECT 1 shr_id, 'JOHN' shr_name
        FROM DUAL
      UNION ALL
      SELECT 2 shr_id, 'DOLPHIN' shr_name
        FROM DUAL),
     shr_quotes AS
     (SELECT 1 shr_id, 8 high, SYSDATE + 1 shr_date
        FROM DUAL
      UNION ALL
      SELECT 1 shr_id, 7 high, SYSDATE + 3 shr_date
        FROM DUAL
      UNION ALL
      SELECT 2 shr_id, 3 high, SYSDATE + 12 shr_date
        FROM DUAL
      UNION ALL
      SELECT 2 shr_id, 99 high, SYSDATE + 8 shr_date
        FROM DUAL)
SELECT x.*
  FROM (SELECT a.shr_name, b.high, MAX (b.high) OVER (PARTITION BY b.shr_id)
                                                                           mx,
               b.shr_date
          FROM shr_list a, shr_quotes b
         WHERE a.shr_id = b.shr_id) x
WHERE x.high = x.mxSHR_NAME     HIGH     MX     SHR_DATE
JOHN     8     8     18/06/2012 22:45:13
DOLPHIN     99     99     25/06/2012 22:45:13