T-SQL查詢來尋找失蹤的ID的日期範圍

Question

鑑於這些表

table Channel 
-------------- 
ChannelID int IDENTITY 
<other irrelevant stuff> 

table Program 
-------------- 
ProgramID int IDENTITY 
ChannelID int 
AiringDate datetime 
<other irrelevant stuff> 

與此查詢

SELECT C.ChannelID, t.AiringDate 
FROM 
Channel C 
LEFT JOIN ( 
    SELECT distinct ChannelID 
    FROM Program 
    WHERE AiringDate = '2010-01-16' 
) p 
     ON p.ChannelID=C.ChannelID 
CROSS JOIN (
    SELECT AiringDate = '2010-01-16' 
) t 
WHERE C.ChannelID IN (1, 2, 74, 15, 906) /* the Channel table contains more channels than we are interested in */ 
    AND p.ChannelID IS NULL 

這將產生

ChannelID | AiringDate 
----------|----------- 
    2  | 2010-01-16 
    906 | 2010-01-16 

我怎樣才能將它修改爲接受日期範圍，以便結果將如

ChannelID | AiringDate 
----------|----------- 
    2  | 2010-01-16 
    906 | 2010-01-16 
    2  | 2010-01-17 
    906 | 2010-01-17 

如果沒有播出這兩個頻道節目的任何這兩天

這不返回行

SELECT C.ChannelID, t.AiringDate 
FROM 
Channel C 
LEFT JOIN ( 
    SELECT distinct ChannelID, AiringDate 
    FROM Program 
    WHERE AiringDate between '2010-01-16' and '2010-01-17' 
) p 
     ON p.ChannelID=C.ChannelID 
CROSS JOIN (
    SELECT AiringDate = '2010-01-16' 
    union 
    SELECT AiringDate = '2010-01-17' 
) t 
WHERE C.ChannelID IN (1, 2, 74, 15, 906) 
    AND p.ChannelID IS NULL 

這CROSS JOIN是有點難看，這將是很好的擺脫它完全。請注意，第一個示例查詢有點複雜;對於單日我有一個簡單的辦法，只有輸出缺少ChannelIDs：

SELECT C.ChannelID 
FROM 
Channel C 
LEFT JOIN ( 
    SELECT distinct ChannelID 
    FROM Program 
    WHERE AiringDate = '2010-01-16' 
) p 
     ON p.ChannelID=C.ChannelID 
WHERE C.ChannelID IN (1, 2, 74, 15, 906) 
    AND p.ChannelID IS NULL 

Answer 1

如果我理解正確的，這應該讓你的要求是什麼。

• 將所有通道，每AiringDate
• 選擇具有你所需要的日期之間AiringDates所有通道。
• LEFT JOIN刪除所有通道已經有AiringDates

SQL語句

DECLARE @Channel TABLE (ChannelID INTEGER PRIMARY KEY) 
DECLARE @Program TABLE (ProgramID INTEGER PRIMARY KEY, ChannelID INTEGER, AiringDate DATETIME) 

INSERT INTO @Channel VALUES (1) -- Aired on 16 & 17 
INSERT INTO @Channel VALUES (2) -- Aired on 16 
INSERT INTO @Channel VALUES (3) -- Not Aired 

INSERT INTO @Program VALUES (1, 1, '01-16-2010') 
INSERT INTO @Program VALUES (2, 1, '01-17-2010') 
INSERT INTO @Program VALUES (3, 2, '01-16-2010') 


SELECT C.* 
FROM (
      SELECT C.ChannelID 
        , p.AiringDate 
      FROM @Channel C   
        CROSS JOIN ( 
        SELECT DISTINCT AiringDate 
        FROM @Program 
        WHERE AiringDate BETWEEN '01-16-2010' AND '01-17-2010' 
       ) p 
     ) c 
     LEFT OUTER JOIN (
      SELECT C.ChannelID, p.AiringDate 
      FROM @Channel C 
        INNER JOIN @Program p ON p.ChannelID = C.ChannelID 
      WHERE AiringDate BETWEEN '01-16-2010' AND '01-17-2010' 
     ) p ON p.ChannelID = C.ChannelID AND p.AiringDate = C.AiringDate 
WHERE p.ChannelID IS NULL AND p.AiringDate IS NULL