ORA-00907: missing right parenthesis 00907. 00000 - "missing right parenthesis" *Cause: *Action: Error at Line: 44 Column: 30 - sql

Question

I am executing the following query:
SELECT *
FROM (SELECT *
FROM (SELECT DISTINCT r.llobjid AS dataid,
r.drawingid,
r.revisionid,
r.revisionnumber AS Revision_Number,
r.revisionlabel,
r.minorrevisionlabel,
r.revisiontype,
p.project AS Project,
r.revisionstatus,
r.r1i AS SignIn_Requestor,
r.r2i AS SeedFileVersion,
rt.display_type_name AS Revision_Type,
rt.can_signin,
rs.display_status_name AS Revision_Status,
a.adntypeid,
at.NAME AS ADN_Type,
a.requestby,
a.assignbyAS Assign_By_Id,
' ' AS Assign_By,
a.assigndate,
' ' AS Assign_Date
FROM adnids a
INNER JOIN crt_revision r
ON r.drawingid = a.adnid
AND Upper(a.wholeid) LIKE '4160%'
INNER JOIN adntypes at
ON a.adntypeid = at.adntypeid
AND at.orgunitid = 21
INNER JOIN crt_project p
ON r.projectid = p.projectid
AND p.ouid = 21
LEFT OUTER JOIN crt_revision_type_map rt
ON r.revisiontype = rt.revtypeid
AND rt.ouid = 21
LEFT OUTER JOIN crt_revision_status_map rs
ON r.revisionstatus = rs.revstatusid
AND rs.ouid = 21
WHERE ( r.revisionstatus = 2 )) tbl1
INNER JOIN (SELECT DISTINCT d.dataid AS LLDataID,
Cast(d.dcomment AS NVARCHAR(4000)) AS
Title,
d.NAME AS Document_Name,
d.createdate AS Created_Date,
d.modifydate AS Modified_Date,
d.subtype,
d.versionnum,
d.permid,
d.reserved,
d.ownerid
FROM crt_revision r3
INNER JOIN adnids a3
ON r3.drawingid = a3.adnid
AND Upper(a3.wholeid) LIKE '4160%'
INNER JOIN dtree d
ON r3.llobjid = d.dataid
WHERE ( r3.revisionstatus = 2 )) tbl2
ON tbl1.dataid = tbl2.lldataid
LEFT OUTER JOIN (SELECT DISTINCT l.dataid AS asm_dataid,
l.stateid,
l.intransition,
ls.NAME AS Current_State,
ls.signin,
ls.lifecycleid,
ll.NAME AS Lifecycle
FROM crt_revision r5
INNER JOIN adnids a5
ON r5.drawingid = a5.adnid
AND Upper(a5.wholeid) LIKE '4160%'
INNER JOIN lm_lifecycles l
ON l.dataid = r5.llobjid
INNER JOIN lm_def_states ls
ON l.stateid = ls.stateid
INNER JOIN lm_def_lifecycles ll
ON ls.lifecycleid =
ll.lifecycleid
WHERE ( r5.revisionstatus = 2 )) tbl4
ON tbl1.dataid = tbl4.asm_dataid
WHERE ( EXISTS (SELECT b.dataid
FROM dtreeacl b
WHERE b.dataid = Nvl(tbl2.permid, tbl2.lldataid)
AND ( rightid IN ( -2, -1, 1000, 1001 ) )
AND see > 0) )
ORDER BY modified_date DESC) tbl100
WHERE rownum <= 25
ORACLE SQL Developer throws an error as: ORA-00907: missing right
parenthesis
It looks like everything is fine but don't understand where am I getting the error of missing right parenthesis.

Answer 1

It is all because of Cast(d.dcomment AS NVARCHAR(4000)). NVARCHAR is not a valid data type.
Change it to Cast(d.dcomment AS NVARCHAR2(2000))
It will work
Fiddle
In the fiddle my sample is
select Cast('ddd' AS NVARCHAR2(2000)) AS dd from dual
If you change it in to
select Cast('ddd' AS NVARCHAR(2000)) AS dd from dual
You will get the error
ORA-00907: missing right parenthesis
Cast Operator in Oracle Tutorial
Data Types in Oracle