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    <p>You can either use the built-in (but deprecated) STRAGG function</p> <pre><code> select sys.stragg(distinct name) from t </code></pre> <p>(please note that distinct seems to be necessary to avoid duplicates)</p> <p>or define your own aggregation function / type:</p> <pre><code>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 -- prevent buffer overflow for more than 4,000 characters if nvl(length(self.total), 0) + nvl(length(value), 0) &lt; 4000 then self.total := self.total || ';' || value; end if; 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; </code></pre> <p>and use it like this:</p> <pre><code>select STRAGG(name) from t </code></pre> <p>I believe this approach was orginally proposed by Tom Kyte (at least, that's where I got it from - <a href="http://asktom.oracle.com/pls/asktom/f?p=100:11:0%3a%3a%3a%3aP11_QUESTION_ID:229614022562" rel="nofollow">Asktom: StringAgg</a></p>
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