# I HAVE A QUESTION ABOUT USING CASE STRUCTURE

Can I compute a percentage using case structure?
In the following query below, I have been able to use CASE STRUCTURE to add to a counter when days were between 0 and 30, or when days were between 31 and 60 or when days were between 61 and 90 or when days were between 91 and 9999. I have also been able to get a GRAND TOTAL of all days between 0 and 9999. This is done in the LAST ITEM of the SELECT STATEMENT. The FIRST ITEM of the SELECT STATEMENT counts rows of records being processed. I want to take the LAST ITEM of the SELECT STATEMENT and MULTIPLY it by 100 and then DIVIDE it by the FIRST ITEM of the SELECT STATEMENT to get a percentage. I know that you can do this with numeric fields in a file but is there a way to do this in CASE STRUCTURE with calculated totals?
SELECT
count(distinct v.rowid) v_cnt,
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) one_mo,
SUM(CASE WHEN(V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) BETWEEN 31 AND 60 THEN 1
ELSE 0
END) two_mo,
SUM(CASE WHEN(V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) BETWEEN 61 AND 90 THEN 1
ELSE 0
END) three_mo,
SUM(CASE WHEN(V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) BETWEEN 91 AND 9999 THEN 1
ELSE 0
END) three_pl_mo,
SUM(CASE WHEN(V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3)) BETWEEN 0 AND 9999 THEN 1
ELSE 0
END) TOT
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.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(+)

Solution for you:
SELECT
COUNT(V_CNT) PROCESS_RECORD,
SUM(CASE WHEN(PROCESS_MONTHS) BETWEEN 0 AND 30 THEN 1
ELSE 0
END) ONE_MO,
SUM(CASE WHEN(PROCESS_MONTHS) BETWEEN 31 AND 60 THEN 1
ELSE 0
END) TWO_MO,
SUM(CASE WHEN(PROCESS_MONTHS) BETWEEN 61 AND 90 THEN 1
ELSE 0
END) THREE_MO,
SUM(CASE WHEN(PROCESS_MONTHS) BETWEEN 91 AND 9999 THEN 1
ELSE 0
END) THREE_PL_MO,
SUM(CASE WHEN(PROCESS_MONTHS) BETWEEN 0 AND 9999 THEN 1
ELSE 0
END) TOT,
(SUM(CASE WHEN(PROCESS_MONTHS) BETWEEN 0 AND 9999 THEN 1
ELSE 0
END) *100/COUNT(V_CNT)) TOT_PER
FROM
(SELECT     V.ROWID V_CNT, V.LCL_ER_RECV_DT - ADD_MONTHS(V.IND_ER_PER_END_DT,3) PROCESS_MONTHS
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.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(+) )
Regards,
Rajs
www.oraclebrains.com

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