创建测试用表：
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CREATE OR REPLACE VIEW V AS
SELECT 'a' AS c FROM dual
UNION ALL
SELECT 'b' AS c FROM dual
UNION ALL
SELECT 'c' AS c FROM dual
UNION ALL
SELECT 'd' AS c FROM dual
UNION ALL
SELECT 'e' AS c FROM dual;
SELECT * FROM v;
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查询语句如下：
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SELECT c
FROM (SELECT c FROM v ORDER BY DBMS_RANDOM.VALUE())
WHERE ROWNUM < 3;
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查询结果如下：