Question

我有一个查询

select sum(pur.purchase_net_invoice_value), par.party_desc  from purchase pur
join party par
on par.party_id = pur.party_id
group by par.party_desc;

运行良好。

我只想查询前五行并弃掉其他查询。

Answer 1

您可以使用ROWNUM Pseudocolumn 来限制行数在子查询中添加ORDER BY子句以定义要显示的行。

SELECT *
FROM (
    select sum(pur.purchase_net_invoice_value), par.party_desc
    from purchase pur
    join party par on par.party_id = pur.party_id
    group by par.party_desc
)
WHERE ROWNUM <= 5;

Answer 2

您可以使用rownum pseduocolumn：

SELECT * 
FROM (SELECT   SUM(pur.purchase_net_invoice_value), par.party_desc
      FROM     purchase pur
      JOIN     party par ON par.party_id = pur.party_id
      GROUP BY par.party_desc
      ORDER BY 1 DESC)
WHERE rownum <= 5;

从sqlplus查询中选择顶行

2 个答案: