Can't i use temp tables in regions?

Hi,
I'm trying to population 3 years fiscal year data in a single row, one for full time and other one for part time employees. So my output should look like this
Population Fy1_Tot Fy1% Fy2_Tot Fy1% Fy3_Tot Fy3%
FT 500 50.0 700 70.0 9000 90.0
PT 500 50.0 300 30.0 1000 10.0
Each fy1 data represents different month, based on the month I have to populate corresponding Fiscal year and I have take care this.
I could do this using TEMP table and works well in Toad but not in HTML DB? Can’t I use temp tables in regions?
Please see the query below
WITH TEMP AS(
SELECT INITCAP(FIELD_VALUE) as Population,
(CASE WHEN D_S_REP.SMC = :P14_MC_FY1 THEN TO_NUMBER(FYT3) END) as Total1,
(CASE WHEN D_S_REP.SMC = :P14_MC_FY1 THEN FYP3 END) as FY1P,
(CASE WHEN D_S_REP.SMC = :P14_MC_FY2 THEN TO_NUMBER(FYT2) END) as Total2,
(CASE WHEN D_S_REP.SMC = :P14_MC_FY2 THEN FYP2 END) as FY2P,
(CASE WHEN D_S_REP.SMC = :P14_MC_FY3 THEN TO_NUMBER(FYT1) END) as Total3,
(CASE WHEN D_S_REP.SMC = :P14_MC_FY3 THEN FYP1 END) as FY3P
FROM D_S_REP
WHERE FIELD_NAME='POPULATION'
AND RS_YR LIKE '%'||TRIM(:P14_S_YR) || '%'
AND D_S_REP.SMC IN (TRIM(:P14_MC_FY1),TRIM(:P14_MC_FY2),TRIM(:P14_MC_FY3))
AND WP_NAME = TRIM(:P14_WP_NAME)
AND RDL_NAME LIKE '%'||TRIM(:P14_EMPLOYEES)||'%'
GROUP BY FIELD_VALUE,D_S_REP.SMC, FYT3,FYP3,FYT2,FYP2,
FYT1,FYP1)
SELECT Population, SUM(Total1), SUM(FY1P), SUM(Total2), SUM(FY2P),SUM(Total3), SUM(FY3P) FROM TEMP
GROUP BY Population
Any thoughts!!
Thanks
CK

Actually the same query works well, in HTML DB too. it was my fault i placed the query in a wrong region so i was getting error..
Thanks

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>> I am aware of the basic criteria like use SET NO COUNT ON, Order the table in which the indexes are created, Do not use SELECT * instead use only columns which are really required, CREATE INDEXes and all.<<
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>> Other than these I am stuck with the usage of temp tables. There are some limitations where I can convert all the Temp table logic to CTE (I am not saying its not possible, I really do not have time to spend for the conversion). Any suggestions are
welcome.<<
Yes! This is how we do declarative/functional programming! Make the effort, so the optimizer can work, so you can use parallelism and so you can port your code out of T-SQL dialect.
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>
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>
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>
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