Question

我必须编写一个SQL查询，我很困惑，我可以通过自联接或使用内部查询来解决它。

我有一个包含列的表

UserID, DateSubscription, Status

Status可以是'E'或'R'。

我必须选择subscription Date between Date1 and Date2且UserID不应加载Status = 'E'且不在Date1和Date2之间的日期范围内的用户的用户

UserID可以存在多个状态不同的行

以下是我试过的查询

SELECT  
       IDNO,
       IND_ID,
       IND_SRC,
       EXPIRY_DATE,
       RECSTA
FROM 
      VIND,
      VSCR
WHERE 
      VIND.IND_ID = VSCR.IND_ID
AND   
      VIND.IND_SRC = VSCR.IND_SRC  
AND 
      EXPIRY_DATE >= '2015-04-25'
AND 
      EXPIRY_DATE <= '2015-06-25'

AND
( 
          RECSTA <> 'E'
      AND
          EXPIRY_DATE > '2015-06-25'
)

Answer 1

如果我理解正确，您希望所有有效期限在A和B之间的记录，以及状态不是E

的所有日期以外的记录

select *
  from yourtable
 where EXPIRY_DATE between @startDateParam and @endDateParam
   or  [Status] <> 'E'

Answer 2

试试这个。

select UserID, DateSubscription
from table
where DateSubscription between @startDate and @endDate and 
(Status <> 'E'  OR  DateSubscription not between @startDate and @endDate)

Answer 3

我使用NOT EXISTS来检查第二项要求

SELECT
    UserID
FROM
    Subscriptions
WHERE
    DateSubscription BETWEEN @date1 and @date2
AND NOT EXISTS
    (SELECT
       NULL
    FROM
        Subscriptions OtherSubscriptions 
    WHERE
        -- Get UserIDs other rows 
        Subscriptions.UserID = OtherSubscriptions.UserID
        -- Only rows that have status 'E'
    AND OtherSubscriptions.Status = 'E'
        -- subscription is before @date1 or after @date2
    AND (OtherSubscriptions.DateSubscription < @date1
        OR OtherSubscriptions.DateSubscription > @date2)

Answer 4

执行此操作的一种方法是group by上的userid并使用HAVING和CASE过滤数据。

SELECT UserID, DateSubscription, Status
FROM UserStatusTable
GROUP BY UserID
HAVING SUM(CASE WHEN DateSubscription BETWEEN Date1 AND Date2 THEN 1 ELSE 0 END) > 1
AND SUM(CASE WHEN DateSubscription NOT BETWEEN Date1 AND Date2 AND Status = 'E' THEN 1 ELSE 0 END) = 0

撰写自我加入查询的混淆

4 个答案: