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| create or replace type string_agg_type as object
(
total varchar2(4000),
static function
ODCIAggregateInitialize(sctx IN OUT string_agg_type )
return number,
member function
ODCIAggregateIterate(self IN OUT string_agg_type ,
value IN varchar2 )
return number,
member function
ODCIAggregateTerminate(self IN string_agg_type,
returnValue OUT varchar2,
flags IN number)
return number,
member function
ODCIAggregateMerge(self IN OUT string_agg_type,
ctx2 IN string_agg_type)
return number
);
/
create or replace type body string_agg_type
is
static function ODCIAggregateInitialize(sctx IN OUT string_agg_type)
return number
is
begin
sctx := string_agg_type( null );
return ODCIConst.Success;
end;
member function ODCIAggregateIterate(self IN OUT string_agg_type,
value IN varchar2 )
return number
is
begin
self.total := self.total || ',' || value;
return ODCIConst.Success;
end;
member function ODCIAggregateTerminate(self IN string_agg_type,
returnValue OUT varchar2,
flags IN number)
return number
is
begin
returnValue := ltrim(self.total,',');
return ODCIConst.Success;
end;
member function ODCIAggregateMerge(self IN OUT string_agg_type,
ctx2 IN string_agg_type)
return number
is
begin
self.total := self.total || ctx2.total;
return ODCIConst.Success;
end;
end;
/
CREATE or replace
FUNCTION stragg(input varchar2 )
RETURN varchar2
PARALLEL_ENABLE AGGREGATE USING string_agg_type;
/
select deptno, stragg(ename)
from emp
group by deptno
DEPTNO
----------
STRAGG(ENAME)
---------------------------------------------------------------------------------
--------------------------------------------------
10
CLARK,KING,MILLER
20
SMITH,FORD,ADAMS,SCOTT,JONES
30
ALLEN,BLAKE,MARTIN,TURNER,JAMES,WARD
would be the approach. |
