如何使用sql server获取与timestamp列相比的Last 6 Month数据

Question

我想显示过去6个月（包括当月）的捕获量，月份值和月份值，如果任何月份没有任何捕获量只显示月份名称和0值为ex：

数据：

[
    {
      "monthText": "May",
      "monthInt": 5,
      "Catches": 10
    },
    {
      "monthText": "April",
      "monthInt": 4,
      "Catches": 12
    },
   {
      "monthText": "June",
      "monthInt": 6,
      "Catches": 0
    }

]

我有查询

SELECT COUNT(CaughtId) as catches, MONTH(DATEADD(mm, -6, GETDATE())) AS MonthValue ,LEFT(DATENAME(mm,  DATEADD(mm, -6, GETDATE())), 3) AS MonthText FROM [dbo].[Catches] fct WHERE fct.[TripId] IN
    (SELECT TripId FROM [dbo].[Trips] WHERE UserId = 'e406d452-3755-4dbb-99a9-1f01df60d842')
    AND fct.Timestamp >= dateadd(month,-6,dateadd(day,datediff(day,0,getdate()),1)) 

以上查询我的输出低于输出

catch   monthvalue   monthname
20         12           Dec

Answer 1

您可以尝试使用此查询：

with dates as (
  select dateadd(month,-5,convert(datetime,convert(varchar,getdate(),112),112)) as datefield
  union all
  select dateadd(month,1,datefield) from dates
  where datefield + 1 <= convert(datetime,convert(varchar,getdate(),112),112)
  )  
,your_data as (
  select 5 as mnt,  10 as catches union all
  select 4 as mnt,  12 as catches union all
  select 6 as mnt,  0 as catches
  )
select datename(month,d.datefield) as MonthName,
  month(d.datefield) as MonthNumber,
  isnull(yd.catches,0) as catches
from dates d
  left join your_data yd
    on month(d.datefield)=yd.mnt
option (maxrecursion 0)

输出：