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 create or replace type list_agg as object
(
total varchar2(4000),
static function ODCIAggregateInitialize(sctx IN OUT list_agg)
return number,
member function ODCIAggregateIterate(self IN OUT list_agg,
value IN varchar2) return number,
member function ODCIAggregateTerminate(self IN list_agg,
returnValue OUT varchar2,
flags IN number)
return number,
member function ODCIAggregateMerge(self IN OUT list_agg,
ctx2 IN list_agg) return number
);
create or replace type body list_agg is
static function ODCIAggregateInitialize(sctx IN OUT list_agg) return number is
begin
sctx := list_agg(null);
return ODCIConst.Success;
end;
member function ODCIAggregateIterate(self IN OUT list_agg,
value IN varchar2) return number is
begin
self.total := self.total || value;
return ODCIConst.Success;
end;
member function ODCIAggregateTerminate(self IN list_agg,
returnValue OUT varchar2,
flags IN number) return number is
begin
returnValue := substr(self.total, 2);
return ODCIConst.Success;
end;
member function ODCIAggregateMerge(self IN OUT list_agg,
ctx2 IN list_agg) return number is
begin
self.total := self.total || ctx2.total;
return ODCIConst.Success;
end;
end;
CREATE OR REPLACE FUNCTION ColumnToRow(input varchar2 )
RETURN varchar2
PARALLEL_ENABLE AGGREGATE USING list_agg;
²âÊÔÓï¾ä:
select ColumnToRow(','||Tname) from tab where rownum<10;