我可以從sql中的選擇中獲得比率嗎？

一旦我確定如何溝通我想要的內容，我會用適當的名稱修改問題。我可以從sql中的選擇中獲得比率嗎？

我有一個名爲batch_log的表，其中有人開始和停止批處理工作。每個條目看起來是這樣的：

"id";"batch_id";"userid";"start_time";"end_time";"time_elapsed" 
"99980";"cd9e4c9e-d8bb-4983-64f4-4e777b451b93";"phastie";"2011-09-22 08:54:34";"2011-09-22 10:07:07";"01:12:33"

我真正想要做的是爲一個特定的人選擇他們有多久相比，總時間爲批次追蹤，以便我可以給他們的信貸那麼多的預計時間。有沒有辦法在SQL中做到這一點？

EDIT [落得這樣做如下：]

SELECT user_time_by_batch.batch_id, userid, user_time_by_batch/total_time_by_batch FROM 
(
    SELECT SUM(time_elapsed) user_time_by_batch, userid, batch_id 
    FROM batch_log 
    Where start_time between "2011-08-01" and now() 
    and end_time is not null and time_elapsed BETWEEN "00:00:00" AND "10:00:00" 
    and batch_id not in ("-1", "-2", "-3", "-4", "-5", "-6", "-7", "-8", "-9", "-10", "-11", "-12", "-13") 
    GROUP BY batch_id, userid 
) user_time_by_batch 
INNER JOIN 
(
    SELECT SUM(time_elapsed) total_time_by_batch, batch_id 
    FROM batch_log 
    Where start_time between "2011-08-01" and now() 
    and end_time is not null and time_elapsed BETWEEN "00:00:00" AND "10:00:00" 
    and batch_id not in ("-1", "-2", "-3", "-4", "-5", "-6", "-7", "-8", "-9", "-10", "-11", "-12", "-13") 

    GROUP BY batch_id 
) total_time_by_batch 
ON user_time_by_batch.batch_id = total_time_by_batch.batch_id

來源

2011-09-22 davidahines

你的意思是要計算TIME_ELAPSED /（END_TIME - START_TIME）是什麼？如果你這樣做，那麼只要你知道從另一個日期中減去一個日期就會給你一個以天爲單位的持續時間，這是相對簡單的。 –

不，他想要計算（time_elapsed_on_batch_id_for_user id/total_time_elapsed_for_batch_id）。注意''time_elapsed' =='（end_time - start_time）' – anothershrubery

這應該給你你需要


SELECT user_id, user_time_by_batch/total_time_by_batch FROM 
(
    SELECT SUM(time_elapsed) user_time_by_batch, user_id, batch_id 
    FROM batch_log 
    GROUP BY batch_id, user_id 
) user_time_by_batch 
INNER JOIN 
(
    SELECT SUM(time_elapsed) total_time_by_batch, batch_id 
    FROM batch_log 
    GROUP BY batch_id 
) total_time_by_batch 
ON user_time_by_batch.batch_id = total_time_by_batch.batch_id

來源

2011-09-22 15:27:53 beon

這真是個好主意，但是當我嘗試向它添加條件時似乎並不奏效。 – davidahines

SELECT用戶ID，user_time_by_batch/total_time_by_batch，BATCH_ID FROM （ SELECT SUM（TIME_ELAPSED）user_time_by_batch，用戶ID，BATCH_ID FROM batch_log WHERE batch_log.userid = 「bclements」 GROUP BY BATCH_ID，用戶ID ）user_time_by_batch INNER JOIN （ SELECT SUM（TIME_ELAPSED）total_time_by_batch，BATCH_ID FROM batch_log WHERE batch_log.userid = 「phastie」 GROUP BY BATCH_ID ）total_time_by_batch ON user_time_by_batch.batch_id = total_time_by_batch.batch_id – davidahines

你會如何添加條件T這個？像在x時間內只有批次一樣？ – davidahines

select batch_id, userid, SUM(end_time - start_time) AS total_user_contribution 
FROM batch_log 
GROUP BY batch_id, userid

將讓你在每個批次的基礎上個體用戶的貢獻。要獲得批次的總時間，可以在檢索上述查詢中的數據時總結各個貢獻，或者運行單獨的查詢以計算其中的總和。

來源

2011-09-22 15:26:00

我可以從sql中的選擇中獲得比率嗎？

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