Question

我有一个表，其中包含以下列

CampName -- Camp Name 
CampId -- Camp Code
CouponCode -- Coupon Code
IsClaimed -- Boolean flag saying if a coupon is claim or not . True or False

此表包含所有优惠券。如果Isclaimed标志设置为true，则使用优惠券。此col的默认值为False

现在我需要创建另一个表

VoucherRegister: 

CampaignName 
CampaignCode
VoucherUsed --> Number of voucher of a specfic campaign which are used 
VoucherUnUsed --> Number of voucher of a specfic campaign which are unused

关于如何创建它的任何想法

Answer 1

由于您的IsClaimed列为布尔值，您可以将1和按CampName和CampId分组

select CampName CampaignName
  ,CampId CampaignCode
  , sum(IsClaimed) VoucherUsed
  , sum(NOT IsClaimed) VoucherUnUsed
from my_table  
group by CampName, CampId

Answer 2

这将起作用：

select cmpname,campid,
(select sum(couponcode) from tablename group by campname where Isclaimed='IsTrue'  ) 
VoucherUsed,
(select sum(couponcode) from tablename group by campname where Isclaimed='IsFalse' ) 
VoucherUnused 
from tablename group by campname,Campid;

Answer 3

通用方法将使用条件聚合：

select CampName as CampaignName,
       CampId CampaignCode,
       sum(case when IsClaimed then 1 else 0 end) as VoucherUsed
       sum(case when IsClaimed then 0 else 1 end) as VoucherUnUsed
from my_table  
group by CampName, CampId;

根据您所使用的数据库，可能有更简单的表达方式，但是以上内容可以在任何数据库中使用。

Answer 4

我的方法

 Select 
T1.CampId AS Campaign_No
,T1.CampName AS Campaign_Name
,(Select Count(T11.CampId) From LocalVouchers T11 where T11.IsClaimed = 'True' and T11.CampId=T1.CampId ) AS Voucher_Used
,(Select Count(T12.CampId) From LocalVouchers T12 where T12.IsClaimed = 'False' and T12.CampId=T1.CampId) AS Voucher_Unused

来自本地优惠券T1 通过...分组 T1.CampId ，T1.CampName

是上述解决方案的组合

SQL分组计数

4 个答案: