MySQL行編號沒有得到理想的結果

Question

我有以下查詢，我想要做的是添加一個列，以確定這是一個不同的客戶的訂單。 entity_id對於每個訂單都是唯一的，所以我想要做的就是為created_at訂購的每個客戶編號唯一的entity_id。 問題是訂單中的每個項目都有一行，因此我的當前查詢編號錯誤。

這是目前的結果

 Order Date          ,OrderID, SKU ,Qty     ,Customer Email   ,First,last  ,seqnum
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','2'
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','3'
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','4'
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','5'
'2015-04-01 14:48:13','19406','103','1.0000','test@google.com','joe','vers','6'
'2015-04-01 14:48:13','19406','102','1.0000','test@google.com','joe','vers','7'
'2015-04-01 14:48:13','19406','102','1.0000','test@google.com','joe','vers','8'
'2015-04-01 14:48:13','19406','102','1.0000','test@google.com','joe','vers','9'
'2015-04-01 14:48:13','19406','201','1.0000','test@google.com','joe','vers','10'
'2015-04-01 14:48:13','19406','102','1.0000','test@google.com','joe','vers','11'
'2015-04-01 14:48:13','19406','105','1.0000','test@google.com','joe','vers','12'
'2015-04-13 17:45:15','20537','105','1.0000','test@google.com','joe','vers','13'
'2015-04-13 17:45:15','20537','102','1.0000','test@google.com','joe','vers','14'
'2015-04-13 17:45:15','20537','201','1.0000','test@google.com','joe','vers','15'
'2015-04-13 17:45:15','20537','201','1.0000','test@google.com','joe','vers','16'
'2015-04-29 14:42:28','22212','102','1.0000','test@google.com','joe','vers','17'
'2015-05-11 17:11:22','23301','102','1.0000','test@google.com','joe','vers','18'

這是期望的結果

 Order Date          ,OrderID, SKU ,Qty     ,Customer Email   ,First,last  ,seqnum
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','201','2.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','103','1.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','102','1.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','102','1.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','102','1.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','201','1.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','102','1.0000','test@google.com','joe','vers','1'
'2015-04-01 14:48:13','19406','105','1.0000','test@google.com','joe','vers','1'
'2015-04-13 17:45:15','20537','105','1.0000','test@google.com','joe','vers','2'
'2015-04-13 17:45:15','20537','102','1.0000','test@google.com','joe','vers','2'
'2015-04-13 17:45:15','20537','201','1.0000','test@google.com','joe','vers','2'
'2015-04-13 17:45:15','20537','201','1.0000','test@google.com','joe','vers','2'
'2015-04-29 14:42:28','22212','102','1.0000','test@google.com','joe','vers','3'
'2015-05-11 17:11:22','23301','102','1.0000','test@google.com','joe','vers','4'

這是查詢：

select sfo.created_at AS "Order Date", sfo.entity_id AS "Order ID",
       left(sfoi.sku,3) AS "SKU", sfoi.qty_ordered,   
       sfo.customer_email AS "Customer Email",     
       sfo.customer_firstname AS "Customer Firstname",     
       sfo.Customer_lastname AS "Customer Lastname",
       (@rn := if(@e = sfo.customer_email, @rn + 1,
                  if(@e := sfo.customer_email, 1, 1)
                 )
       ) as seqnum
from sales_flat_order sfo join
     sales_flat_order_item sfoi
     on sfoi.order_id = sfo.entity_id join
     sales_flat_order_address sfoa        
     on sfoa.entity_id = sfo.billing_address_id cross join
     (select @rn := 0, @e := '') params
order by sfo.customer_email, created_at;

Answer 1

啊，我明白了。 訂單是基於電子郵件的數字。 好的。

select sfo.created_at AS "Order Date", sfo.entity_id AS "Order ID",
       left(sfoi.sku,3) AS "SKU", sfoi.qty_ordered,   
       sfo.customer_email AS "Customer Email",     
       sfo.customer_firstname AS "Customer Firstname",     
       sfo.Customer_lastname AS "Customer Lastname",
       (@rn := if(@e = sfo.customer_email,
                  if(@o = sfo.entity_id, @rn,
                     if(@o := sfo.entity_id, @rn + 1, @rn + 1
                       )
                    ),
                  if(@e := sfo.customer_email,
                     if(@o := sfo.entity_id, 1, 1),
                     if(@o := sfo.entity_id, 1, 1)
                    )
                 )
       ) as seqnum
from sales_flat_order sfo join
     sales_flat_order_item sfoi
     on sfoi.order_id = sfo.entity_id join
     sales_flat_order_address sfoa        
     on sfoa.entity_id = sfo.billing_address_id cross join
     (select @rn := 0, @e := '', @o := -1) params
order by sfo.customer_email, created_at, orderid;

這假設created_at對於每個訂單都是相同的。