I HAVE ANOTHER PROBLEM WITH MY DECODE

Question

Here is the following decode in an SQL statement.
SELECT
SUM(DECODE(V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) > 0) AND
((V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) <= 30),1,0)
FROM NCOER V, NCOER_IN_ERROR NIE, NCOER_ERROR NE, ALL_CMD_VIEW ACV
WHERE V.MIL_CMD_ASGN_CD IN ('FC')
and v.lcl_er_form_cd = '4'
and acv.cmd_cd = v.mil_cmd_asgn_cd
and nvl(acv.lcl_code_stat,'N') = 'Y'
and NVL(v.lcl_omit_from_stats_ind,'N') <> 'Y'
AND V.PSC_CD IN ('FS10')
AND (V.LCL_ER_RECV_DT >= '01-MAR_2007' AND V.LCL_ER_RECV_DT <= '31-MAR-2007')
AND ((V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) > 0) AND((V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) <= 30)
AND V.IND_SSN = NIE.IND_SSN(+)
AND V.IND_ER_PER_END_DT = NIE.IND_ER_PER_END_DT(+)
AND V.LCL_ER_RECV_DT = NE.LCL_ER_RECV_DT(+)
AND V.IND_SSN = NE.IND_SSN(+)
AND V.IND_ER_PER_END_DT = NE.IND_ER_PER_END_DT(+)
AND V.LCL_ER_RECV_DT = NE.LCL_ER_RECV_DT(+)
I get the following error message ORA-00907 Missing right parenthesis
I want to sum up all the records when the difference between 2 dates is greater than 0 and less than 30. I know that I can do it by using a COUNT function and without a DECODE but I would like to use a DECODE. How do I go about doing this?

Answer 1

in DECODE() you cannot include an operators such as the greater than, less than, and/or equal sign.
instead you can use the CASE...WHEN in the SELECT statement:
SELECT Sum(case when (V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) between 0 and 30 then 1
                else 0
           end) as sm
  FROM NCOER V, NCOER_IN_ERROR NIE, NCOER_ERROR NE, ALL_CMD_VIEW ACV
WHERE V.MIL_CMD_ASGN_CD IN ('FC')
   and v.lcl_er_form_cd = '4'
   and acv.cmd_cd = v.mil_cmd_asgn_cd
   and nvl(acv.lcl_code_stat,'N') = 'Y'
   and NVL(v.lcl_omit_from_stats_ind,'N') <> 'Y'
   AND V.PSC_CD IN ('FS10')
   AND (V.LCL_ER_RECV_DT >= '01-MAR_2007' AND V.LCL_ER_RECV_DT <= '31-MAR-2007')
   AND ((V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) > 0) AND((V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) <= 30)
   AND V.IND_SSN = NIE.IND_SSN(+)
   AND V.IND_ER_PER_END_DT = NIE.IND_ER_PER_END_DT(+)
   AND V.LCL_ER_RECV_DT = NE.LCL_ER_RECV_DT(+)
   AND V.IND_SSN = NE.IND_SSN(+)
   AND V.IND_ER_PER_END_DT = NE.IND_ER_PER_END_DT(+)
   AND V.LCL_ER_RECV_DT = NE.LCL_ER_RECV_DT(+)note: untested.