Question

我有三张桌子和一系列两个日期：

Services
ServicesClients
ServicesClientsDone


@StartDate
@EndDate

服务：

ID | Name
1  | Supervisor
2  | Monitor
3  | Manufacturer

ServicesClients：

IDServiceClient | IDClient | IDService
1               | 1        | 1
2               | 1        | 2
3               | 2        | 2
4               | 2        | 3

ServicesClientsDone：

IDServiceClient | Period 
1               | 201208
3               | 201210

期间= YYYYMM

我需要在@StartDate @EndDate的月份范围内插入ServicesClientsDone。我还有一个临时表（#Periods），其中包含以下列表：

Period
201208
201209
201210

我需要的查询是给我回复以下列表：

IDServiceClient | Period
1               | 201209
1               | 201210
2               | 201208
2               | 201209
2               | 201210
3               | 201208
3               | 201209
4               | 201208
4               | 201209
4               | 201210

哪些是客户服务，但是临时表的排名，而不是那些已经插入的

这就是我所拥有的：

表期间：

DECLARE @i int
DECLARE @mm int
DECLARE @yyyy int,
DECLARE @StartDate datetime
DECLARE @EndDate datetime

set @EndDate = (SELECT GETDATE())
set @StartDate = (SELECT DATEADD(MONTH, -3,GETDATE()))

CREATE TABLE #Periods (Period int)

set @i = 0

WHILE @i <= DATEDIFF(MONTH, @StartDate , @EndDate )
BEGIN
    SET @mm= DATEPART(MONTH, DATEADD(MONTH, @i, @FechaInicio))
    SET @yyyy= DATEPART(YEAR, DATEADD(MONTH, @i, @FechaInicio))

    INSERT INTO #Periods (Period) 
        VALUES (CAST(@yyyy as varchar(4)) + RIGHT('00'+CONVERT(varchar(6), @mm), 2))

    SET @i = @i + 1;
END

ServicesClients与Services之间的关系：

SELECT s.Name, sc.IDClient FROM Services
    JOIN ServicesClients AS sc
      ON sc.IDService = s.ID

服务已完成且何时：

SELECT s.Name, scd.Period FROM Services
    JOIN ServicesClients AS sc
      ON sc.IDService = s.ID
    JOIN ServicesClientsDone AS scd
      ON scd.IDServiceClient = sc.IDServiceClient

问题是：如何在没有服务的情况下获取客户端和日期范围内安装的服务之间的列表？

Answer 1

使用left join。

select ServicePeriods.*  
from 
(
    SELECT sc.IDServiceClient, period 
    FROM Services s
    inner join ServicesClients AS sc 
    cross join #periods 
      ON sc.IDService = s.ID 
) ServicePeriods 
    left join 
(
    SELECT scd.IDServiceClient, scd.Period 
    FROM Services s
    INNER JOIN ServicesClients AS sc 
      ON sc.IDService = s.ID 
    INNER JOIN ServicesClientsDone AS scd 
      ON scd.IDServiceClient = sc.IDServiceClient
) exclude
    on ServicePeriods.IDServiceClient = exclude.IDServiceClient  
    and ServicePeriods.Period = exclude.Period 
where exclude.IDServiceClient is null

或使用except查询

SELECT sc.IDServiceClient, period 
FROM Services s
    INNER JOIN ServicesClients AS sc 
    cross join periods 
      ON sc.IDService = s.ID 

EXCEPT

SELECT scd.IDServiceClient, scd.Period 
FROM Services s
    INNER JOIN ServicesClients AS sc 
      ON sc.IDService = s.ID 
    INNER JOIN ServicesClientsDone AS scd 
      ON scd.IDServiceClient = sc.IDServiceClient

数据混合SQL Server

1 个答案: