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select - How to get records randomly from the oracle database?

in Technique[技术] by (71.8m points)

I need to select rows randomly from an Oracle DB.

Ex: Assume a table with 100 rows, how I can randomly return 20 of those records from the entire 100 rows.

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by (71.8m points) 
SELECT *
FROM   (
    SELECT *
    FROM   table
    ORDER BY DBMS_RANDOM.RANDOM)
WHERE  rownum < 21;

与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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