SQL查詢查找每個工單的最後關閉seq_id

Question

由於我不擅長編寫SQL查詢以便尋求幫助。

我有下面給出的數據集。

我需要編寫一個查詢找到

最後的查詢只應與seq_id返回行的「爲每個工作單上次關閉seq_id」 = 24,28,32 enter image description here

Answer 1

假設你真的表示 「32」，而不是 「31」，然後row_number()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 2

嘗試這種情況：

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 3

試試這個：

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

Answer 4

這將工作的32

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