Question

我有以下数据，我想检索为单行。

客户

customer id    customer name  order id

1               Jhon           1

2                philips       1

Order id   order name  order status   order status time
----------------------------------------------------------------    
   1       iphone      delivered      20121011 12:10:01
   1       iphone      cancelled      20121011 14:30:00

根据以上数据，我必须显示如下

order id  order name  order status(D)  order status(C) order status(c) time  order status(D) time
------------------------------------------------------------------------------------------------    
   1      iphone      delivered        cancelled       20121011 14:30:00     20121011 12:10:01

请帮我写这个SQL

此致

Chaitu

Answer 1

您可以使用聚合函数和CASE语句：

select orderid,
  ordername,
  max(case when orderstatus = 'delivered' then orderstatus end) OrderStatusD,
  max(case when orderstatus = 'cancelled' then orderstatus end) OrderStatusC,
  max(case when orderstatus = 'delivered' then orderstatustime end) OrderStatusDTime,
  max(case when orderstatus = 'cancelled' then orderstatustime end) OrderStatusCTime
from yourtable
group by orderid, ordername

请参阅SQL Fiddle with Demo

根据您的评论，您可以使用以下内容：

select * 
from 
(
  select c.*, 
    row_number() over(partition by orderid order by customerid) rn
  from customer c
) c
inner join
(
  select orderid,
    ordername,
    max(case when orderstatus = 'delivered' then orderstatus end) OrderStatusD,
    max(case when orderstatus = 'cancelled' then orderstatus end) OrderStatusC,
    max(case when orderstatus = 'delivered' then orderstatustime end) OrderStatusDTime,
    max(case when orderstatus = 'cancelled' then orderstatustime end) OrderStatusCTime
  from yourtable
  group by orderid, ordername
) table1
  on c.orderid = table1.orderid
  and c.rn = 1

请参阅SQL Fiddle with Demo

Answer 2

您可以进行自我加入，然后过滤状态

select 
  yt_d.orderid,
  yt_d.ordername,
  yt_d.orderstatus orderstatusD,
  yt_c.orderstatus orderstatusC,
  yt_d.orderstatustime orderstatustimeD,
  yt_c.orderstatustime orderstatustimeC 


from yourtable yt_d
     INNER JOIN yourtable yt_c
      ON yt_d.orderid = yt_c.orderID

where
  yt_d.orderstatus = 'delivered' 
  and yt_c.orderstatus = 'cancelled'

SQL Fiddle demo

如果涉及更多表并且您想要左连接

，则可以在连接中包含过滤器

e.g。

    order o
    LEFT JOIN order_status d
      on o.orderID = d.orderID
        and d.Status = 'delivered'


    LEFT JOIN order_status c
      on o.orderID = c.orderID
        and c.Status = 'canceled'

SQL检索单行

2 个答案: