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WITH s (a, b) AS (SELECT 1, 'ff' FROM DUAL UNION ALL SELECT 1, 'ee' FROM DUAL UNION ALL SELECT 1, 'ee' FROM DUAL UNION ALL SELECT 2, 'ee' FROM DUAL), t (a, b) AS ( SELECT s.a, COLLECT (s.b) FROM s group BY s.a) select t.a, x.column_value as b from t outer apply t.b x
A
B
1
ff
1
ee
1
ee
2
ee
WITH s (a, b) AS (SELECT 1, 'ff' FROM DUAL UNION ALL SELECT 1, 'ee' FROM DUAL UNION ALL SELECT 1, 'ee' FROM DUAL UNION ALL SELECT 2, 'ee' FROM DUAL), t (a, b) AS ( SELECT s.a, COLLECT (s.b) FROM s group BY s.a) select t.a, t.b.first() from t
ORA-00904: "T"."B"."FIRST": invalid identifier