Help regarding Materialized view ( subquery expression not allowed here )

Question

Hi all,
while creating materialized view i got following error
ORA- 22818
subquery expression not allowed here
following is my query
CREATE  MATERIALIZED VIEW MV_NAV_REC
BUILD IMMEDIATE
REFRESH COMPLETE ON DEMAND
as
select folio_no FOLIONO,CHKDIGIT as Check_Digit,sch_code SCHEMECODE, sysdate as FOLIODATE ,
     (select case when count(distinct SUBBROKERCODE) =1 then to_char(max(SUBBROKERCODE)) else 'Multiple Broker' end   from transaction_st
     where folio_no = tst.folio_no
     group by  folio_no)  ARN_Number ,
     (select sum(case when tran_type in ('PURCHASE','SWITCH IN') then UNITS else 0 - UNITS end ) from transaction_st
     where folio_no = tst.folio_no AND SCH_CODE = tst.sch_code
     group by  folio_no,sch_code)  NUM_UNITS_NEW ,
--SUM (case when tran_type NOT in ('REDEMPTION','SWITCH OUT') THEN UNITS ELSE 0 - UNITS END )  AS  Num_Units,
     (select sum(case when tran_type in ('PURCHASE','SWITCH IN') then AMOUNT else 0 - AMOUNT end ) from transaction_st
     where folio_no = tst.folio_no AND SCH_CODE = tst.sch_code
     group by  folio_no,SCH_CODE) as NUM_AMOUNT_NEW ,
--SUM (case when tran_type NOT in ('REDEMPTION','SWITCH OUT') THEN AMOUNT ELSE 0 -AMOUNT  END )  AS  Scheme_Amount,
sum(  CASE WHEN upper(tran_type) NOT in ('REDEMPTION','SWITCH OUT') THEN
             units * (select nav_rs from nav_rec where nav_rec.sch_code = tst.sch_code and nav_rec."Date" = /*trunc(sysdate)*/to_date('23/03/2009','dd/mm/yyyy'))
           ELSE  (0 - units) * (select nav_rs from nav_rec where nav_rec.sch_code = tst.sch_code and nav_rec."Date" = /*trunc(sysdate)*/to_date('23/03/2009','dd/mm/yyyy')) END  ) Scheme_Valuation ,
null as SCHEMEPHRASEID ,
null as "Prefered Mode of SOA",
(  select sum(      case when upper(tran_type) NOT in ('REDEMPTION','SWITCH OUT') THEN AMOUNT ELSE 0 - AMOUNT END  ) from transaction_st t where t.folio_no = tst.folio_no group by folio_no )  as Folio_Amount,
               select sum(CASE when upper(tran_type) NOT in ('REDEMPTION','SWITCH OUT') THEN
                                          units * ( select nav_rs from nav_rec where nav_rec.sch_code = ts.sch_code and nav_rec."Date" = /*trunc(sysdate)*/to_date('23/03/2009','dd/mm/yyyy'))
                              ELSE
                                  (0 - units) * ( select nav_rs from nav_rec where nav_rec.sch_code = ts.sch_code and nav_rec."Date" = /*trunc(sysdate)*/to_date('23/03/2009','dd/mm/yyyy')) END     
                              )  from transaction_st ts where ts.folio_no =tst.folio_no  group by ts.folio_no
) as Folio_Valuation
from transaction_st   tst 
group by folio_no ,sch_code,CHKDIGIT
order by folio_no , SCH_CODE
please help me

Answer 1

Hi,
You cannot use scalar subqueries in a materialized view.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:4110947624538#22981269011674
edit
From 10g doc:
ORA-22818: subquery expressions not allowed here
Cause: An attempt was made to use a subquery expression where these are not supported.
Action: Rewrite the statement without the subquery expression.
(http://download.oracle.com/docs/cd/B19306_01/server.102/b14219/e19400.htm#sthref6020)
Edited by: hoek on Jun 10, 2009 7:56 AM