SQLite上個月

Question

我想在spiceworks中創建一個需要上個月數據的報告。我在這裏看到了這個鏈接：Query last day, last week, last month SQLite但是這個月的例子只返回當前月份。我需要上個月。該報告將在每個月的第一天，在這裏跑出就是我迄今：

SELECT a.id as "Ticket #", c.first_name||' '|| c.last_name as "Created By", a.c_location as "Location", 
    a.c_hud as "HUD", a.closed_at as "Closed", a.c_urgency as "Urgency", a.category as "Category", 
    a.summary as "Summary", SUM(b.time_spent)/3600.0 as "Time Spent (Hrs)", 
    d.price*d.quantity as "Purchases" 
FROM tickets a 
LEFT OUTER JOIN ticket_work b ON a.id = b.ticket_id 
LEFT OUTER JOIN purchase_list_items d on a.id = d.ticket_id 
JOIN users c ON a.created_by = c.id 
WHERE closed_at BETWEEN datetime('now', 'start of month') AND datetime('now','localtime') 
GROUP BY a.id 
ORDER BY c_location; 

一旦我把它拉正確的數據集，我必須將總b.time_spent領域這是整數轉換鍵入，轉換爲小時格式。因此，如果花費的時間爲33600，那麼我需要將輸出轉換爲9.33，否則就是當前輸出的9。它目前只給我任何幫助將不勝感激。

Answer 1

要做浮點除法，至少有一個數字必須是浮點數。 使用：

SUM(b.time_spent)/3600.0