SQL EXTRACT FUNCTION

Question

Hi,
In One of our tables, there are some invalid dates have been found the application is unable to show up those values.
I used the below query to get the row distribution.
SELECT EXTRACT(YEAR FROM X_EFF_DT) YEAR,COUNT(X_EFF_DT) "X_EFF_DT" FROM CDMST GROUP BY EXTRACT(YEAR FROM X_EFF_DT) ORDER BY "X_EFF_DT" DESC.
X_EFF_DT has some invalid date values in the Database.
The table has another column. CREATED which has the valid date values.
now, i want to extract the rows using CREATED to find the X_EFF_DT values based on Year.
Can some one give me a clue on how to do it.

Answer 1

id date is invalid then it will give you error
SQL> ed
Wrote file afiedt.buf
  1  select extract(year from sysdate),
  2         extract(month from sysdate)
  3*  from dual
SQL> /
EXTRACT(YEARFROMSYSDATE) EXTRACT(MONTHFROMSYSDATE)
                    2008                         3