Create Materialized view Error ORA-22818

Question

Hi,
I am creating a materialized view based on a complex query with inline queries, below is a simplified version of the query:
CREATE MATERIALIZED VIEW CM_FA_PEND_mvu
TABLESPACE CISTS_TH
BUILD IMMEDIATE
REFRESH COMPLETE
ENABLE QUERY REWRITE
AS
SELECT/*+ index (a,XT094S3) index (b,XT232S1) index (c, XM143P0) index (d, XM185S1)*/
a .fa_id,
a.fa_type_cd,
a.fa_status_flg,
a.disp_grp_cd,
(SELECT dl.descr
FROM ci_disp_grp_l dl
WHERE dl.disp_grp_cd = a.disp_grp_cd AND dl.language_cd = 'ENG')
disp_grp_cd_descr
FROM ci_fa a,
ci_sp_mtr_hist b,
ci_mtr_config c,
ci_reg d,
ci_fapr_faty e
WHERE a.fa_type_cd = e.fa_type_cd
AND a.sp_id = b.sp_id(+)
AND b.mtr_config_id = c.mtr_config_id(+)
AND c.mtr_id = d.mtr_id(+)
AND a.fa_status_flg = 'P'
AND e.fa_type_prof_cd = 'METERED'
AND ( (b.removal_dttm IS NULL))
I am getting error "ORA-22818: subquery expressions not allowed here". the problem is in columns "disp_grp_cd_descr" (when I remove this column from the query, the MView is created successfully)
Is using inline queries as columns a limitation on creating materialized view?
Is there a workaround ?
Thanks
AK

Answer 1

No version and no exception ... the full text is necessary the number alone insufficient ... to help you much other than recommend you read this:
http://download.oracle.com/docs/cd/E11882_01/server.112/e10810/basicmv.htm#DWHSG8195
where it says:
"The SELECT clause in the materialized view creation statement defines the data that the materialized view is to contain. Only a few restrictions limit what can be specified. Any number of tables can be joined together. Besides tables, other elements such as views, inline views (subqueries in the FROM clause of a SELECT statement), subqueries, and materialized views can all be joined or referenced in the SELECT clause. You cannot, however, define a materialized view with a subquery in the SELECT list of the defining query. You can, however, include subqueries elsewhere in the defining query, such as in the WHERE clause."
Something you could have found in a second or two in the docs at http://tahiti.oracle.com by searching for "Materialized Views Restrictions"
But without your version and the actual error message this may not apply.