SQLite上个月

Question

我正在尝试在spiceworks中创建一个需要上个月数据的报告。我在这里看到了这个链接：Query last day, last week, last month SQLite但是月份示例仅返回当前月份。我需要上个月。报告将在每个月的第一天运行，这是我迄今为止所做的：

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;

一旦我得到了正确的数据集，我就必须将整数b.time_spent字段转换为小时格式。因此，如果花费的时间总和为33600，我需要将输出转换为9.33，这是它当前给出的9。它目前只给予我任何帮助将不胜感激。

Answer 1

要进行浮点除法，至少有一个数字必须是浮点数。 使用：

SUM(b.time_spent) / 3600.0