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Oracle listagg Function

Expert Oracle Tips by Burleson Consulting

December 7, 2010

Question: What is the Oracle listagg function?  I hear that there is a new way to pivot columns onto a single display row?

Answer:  Oracle 11gR2 listagg built-in function allows for many table columns to be displayed within a single row, a non-first-normal form display:

select
   deptno,
   listagg (ename, ',') WITHIN GROUP (ORDER BY ename)
   enames
from
   emp
group by
   deptno;

DEPTNO     ENAMES                                           
---------- --------------------------------------------------
        10 CLARK,KING,MILLER                                
        20 ADAMS,FORD,JONES,SCOTT,SMITH                     
        30 ALLEN,BLAKE,JAMES,MARTIN,TURNER,WARD             

Prior to the listagg function, we had other SQL syntax for converting rows to columns, including the old sys_connect_by_path and the 11g pivot operator and within group operators.

 
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