[英]Get records for last month
我需要獲取上個月的客戶 ID、數量和訂單金額。
Paper::select('customer_id', DB::raw('SUM(price) as `sum`')
,DB::raw('COUNT(*) as `orders_per_month`'))
->where('created_at', '>=', Carbon::now()->startOfMonth())
->groupBy('customer_id')->get()
我試過了,但是如果上個月客戶沒有訂單,就不會被選中
嘗試合並:
DB::raw('COALESCE(COUNT(*), 0) as `orders_per_month`')
此函數允許您定義默認值,否則為 NULL。
http://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#function_coalesce
更新:
我想如果你只選擇上個月有訂單的客戶,那么你肯定不會得到那些沒有訂單的客戶。
您可以通過以下方式實現您的需求:
mysql> select * from cu;
+----+----------+
| id | name |
+----+----------+
| 1 | Google |
| 2 | Yahoo |
| 3 | Mirosoft |
+----+----------+
3 rows in set (0.00 sec)
mysql> select * from so;
+----+-------------+---------------------+-------+
| id | customer_id | created_at | price |
+----+-------------+---------------------+-------+
| 1 | 1 | 2016-08-23 12:12:12 | 2 |
| 2 | 1 | 2016-09-24 12:14:13 | 3 |
| 3 | 2 | 2016-09-25 00:00:00 | 5 |
| 4 | 2 | 2016-09-12 09:00:00 | 3 |
+----+-------------+---------------------+-------+
4 rows in set (0.00 sec)
mysql> select cu.id as customer_id, coalesce(sum(so.price),0) as total, coalesce(count(so.customer_id),0) as orders_per_month from cu left join so on (cu.id = so.customer_id) where so.created_at >= '2016-09-01 00:00:00' or so.created_at is null group by cu.id;
+-------------+-------+------------------+
| customer_id | total | orders_per_month |
+-------------+-------+------------------+
| 1 | 3 | 1 |
| 2 | 8 | 2 |
| 3 | 0 | 0 |
+-------------+-------+------------------+
3 rows in set (0.00 sec)
但是,作為一種或另一種方式,結果查詢的效率不會很高,您必須掃描所有客戶並加入 JOIN 以獲取那些沒有訂單的客戶。 分別獲取有訂單和無訂單的客戶列表並將它們與 UNION 或通過您的應用程序代碼合並可能會更快。
mysql> select customer_id, sum(total) as total, sum(orders_per_month) as orders_per_month from (select id as customer_id, 0 as total, 0 as orders_per_month from cu union all select customer_id, sum(so.price) as total, count(so.customer_id) as orders_per_month from so where created_at >= '2016-09-01 00:00:00'group by customer_id) agg group by customer_id;
+-------------+-------+------------------+
| customer_id | total | orders_per_month |
+-------------+-------+------------------+
| 1 | 3 | 1 |
| 2 | 8 | 2 |
| 3 | 0 | 0 |
+-------------+-------+------------------+
3 rows in set (0.00 sec)
試試這個
Paper::select('customer_id', DB::raw('SUM(price) as `sum`'),
DB::raw('COUNT(*) as `orders_per_month`')
)
->whereMonth('created_at', Carbon::now()->month)
->whereYear('created_at', Carbon::now()->year)
->groupBy('customer_id')->get()
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