Question

因为我不是编写SQL查询的专家所以想要帮助。

我有以下给定的数据集。

我需要编写一个查询来查找每个工单的＆＃34;最后关闭的seq_id＆＃34;

最终查询应仅返回seq_id = 24,28,32的行 enter image description here

Answer 1

试试这个：

SELECT   sts
        ,workorder_id
        ,MAX(SEQ_ID) AS Last_Seq_ID
FROM mytablename
WHERE sts = 'Closed' -- Only include Closed records
GROUP BY sts, workorder_id
ORDER BY workorder_id -- This line is optional; it will sort your result

Answer 2

这将起作用

SELECT workorder_id
      ,max(seq_id) 
from   your_table 
where  sts="Closed" 
group by workorder_id

Answer 3

假设你的意思是“32”而不是“31”，那么row_number()就是典型的方法：

select t.*
from (select t.*,
             row_number() over (partition by workorder_id order by seq_id desc) as seqnum
      from t
      where sts = 'Closed'
     ) t
where seqnum = 1;

Answer 4

试试这个：

select workorder_id,max(seq_id) as seqid
from testtable 
where sts='Closed'
group by workorder_id

SQL查询以查找每个工作订单的最后一个关闭的seq_id

4 个答案: