oracle top n sentences

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#11g #ORACLE #database #dba #分页

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本文介绍了Oracle数据库中实现TOP-N查询的方法，包括基本的TOP-N查询、带条件的TOP-N查询及分页查询等，并展示了如何在涉及多表连接的情况下进行TOP-N查询。

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Oracle has some sentences for top n

version oracle 10g 11g

TOP-N
SELECT * FROM (
  SELECT name, id
  FROM test
  ORDER BY id DESC
) WHERE rownum <= 5;
SELECT * FROM (
  SELECT name, id 
  FROM test
  WHERE type='0'
  ORDER BY id DESC 
) WHERE rownum <= 5;
分页
SELECT * FROM (
  SELECT * FROM (
    SELECT name, id,
      rownum AS rn
    FROM test
    WHERE type='0'
    ORDER BY id DESC
  ) WHERE rownum <= 20
) WHERE rn > 10;
Top-N with joins
SELECT * FROM (
  SELECT t.name , t.id,  e.dept
  FROM test t, em_ct e
  WHERE t.id = e.id
    AND t.type='0'
  ORDER BY t.idDESC
) WHERE rownum <= 5
/