Dynamic Oracle Pivot_In_Clause - sql

Question

I'm kinda stuck. I want to do a user-role-relationship pivot table and my query so far looks like this:
WITH PIVOT_DATA AS (
SELECT *
FROM
(
SELECT USERNAME, GRANTED_ROLE
FROM DBA_USERS#DB_LINK U LEFT OUTER JOIN DBA_ROLE_PRIVS#DB_LINK R
ON U.USERNAME = R.GRANTEE
)
)
SELECT *
FROM PIVOT_DATA
PIVOT
(
COUNT(GRANTED_ROLE)
FOR GRANTED_ROLE
IN('CONNECT') -- Just an example
)
ORDER BY USERNAME ASC;
It works really fine and does the job, but I don't want to write to write any role I want to search for in the pivot_in_clause, because we got like tons of them and I don't want to check every time if there are any changes.
So is there a way to write a SELECT in the pivot_in_clause? I tried it myself:
[...]
PIVOT
(
COUNT(GRANTED_ROLE)
FOR GRANTED_ROLE
IN( SELECT ROLE FROM DBA_ROLES#DB_LINK )
)
[...]
But it always gives me an ORA-00936: "missing expression" in line 1 of the whole query and I don't know why. Can't there be a SELECT in the pivot_in_clause or am I doing it wrong?

Answer 1

You can build dynamic query in your script,
look at this example:
variable rr refcursor
declare
bb varchar2(4000);
cc varchar2( 30000 );
begin
WITH PIVOT_DATA AS (
SELECT *
FROM
(
SELECT USERNAME, GRANTED_ROLE
FROM DBA_USERS U LEFT OUTER JOIN DBA_ROLE_PRIVS R
ON U.USERNAME = R.GRANTEE
)
)
select ''''|| listagg( granted_role, ''',''' )
within group( order by granted_role ) || '''' as x
into bb
from (
select distinct granted_role from pivot_data
)
;
cc := q'[
WITH PIVOT_DATA AS (
SELECT *
FROM
(
SELECT USERNAME, GRANTED_ROLE
FROM DBA_USERS U LEFT OUTER JOIN DBA_ROLE_PRIVS R
ON U.USERNAME = R.GRANTEE
)
)
SELECT *
FROM PIVOT_DATA
PIVOT
(
COUNT(GRANTED_ROLE)
FOR GRANTED_ROLE
IN(]' || bb || q'[) -- Just an example
)
ORDER BY USERNAME ASC]';
open :rr for cc;
end;
/
SET PAGESIZE 200
SET LINESIZE 16000
print :rr
Here is the result (only small fragment, because it is very wide and long)
-----------------------------------------------------------------------------------------------------------------------------------
USERNAME 'ADM_PARALLEL_EXECUTE_TASK' 'APEX_ADMINISTRATOR_ROLE' 'AQ_ADMINISTRATOR_ROLE' 'AQ_USER_ROLE'
------------------------------ --------------------------- ------------------------- ----------------------- ----------------------
ANONYMOUS 0 0 0 0
APEX_030200 0 0 0 0
APEX_PUBLIC_USER 0 0 0 0
APPQOSSYS 0 0 0 0
..............
IX 0 0 1 1
OWBSYS 0 0 1 1