sql - LISTAGG in ORACLE -

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i trying use listagg() fetch more 2 columns.

select deptname, deptno, listagg(ename, ',') within group (order ename) employees  emp  group deptno;

but throwing error:

: keyword not found expected  00000 -  "from keyword not found expected" *cause:     *action: error @ line: 3 column: 12

can please explain why is?

the listagg analytic function introduced in oracle 11g release 2. so, if on older version, won't able use it.

the error seems strange. should ora-00904: "deptname": invalid identifier standard emp table in scott schema doesn't have deptname column. also, should ora-00979: not group expression did not mention selected columns in group by expression.

using standard emp table in scott schema:

sql> select deptno,   2    job,   3    listagg(ename, ',') within group (   4  order ename) employees   5  emp   6  group deptno,   7    job;      deptno job       employees ---------- --------- ------------------------         10 clerk     miller         10 manager   clark         10 president king         20 clerk     adams,smith         20 analyst   ford,scott         20 manager   jones         30 clerk     james         30 manager   blake         30 salesman  allen,martin,turner,ward  9 rows selected.  sql>

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