檢索日期

Question

之間記錄我有以下查詢將檢索作爲參數提供的開始日期和結束日期之間的事件：

SELECT * FROM events 
WHERE (startDate BETWEEN CAST(@start AS DATETIME) AND CAST(@end AS DATETIME) 
OR endDate BETWEEN CAST(@start AS DATETIME) AND CAST(@end AS DATETIME)) 

這工作得很好，爲獲取重疊的開始和結束時間的事件，但將不會得到那些時代之間完全封裝的事件。一張圖片可能會使它變得清晰：

Event A |------------------------------------------------------------------| Event B ----------------------|------------|-------------------------------

Where | represents a start or end date

在我的照片，用我的查詢與開始和結束時間爲事件B，它不會檢索事件A

如何更改查詢以便顯示所有重疊和封裝的事件？

Answer 1

SELECT * FROM events 
WHERE (startDate BETWEEN CAST(@start AS DATETIME) AND CAST(@end AS DATETIME) 
OR endDate BETWEEN CAST(@start AS DATETIME) AND CAST(@end AS DATETIME)) 
OR (endDate >= CAST(@end AS DATETIME)) AND startDate <= CAST(@end AS DATETIME)) 

最後OR線將增加所有行開始比你的最終參數小，到底是比大。這樣，與@end重疊的所有行都將被匹配。你也可以嘗試：

SELECT * FROM events 
WHERE 
(startDate <= CAST(@start AS DATETIME)) AND endDate >= CAST(@start AS DATETIME)) 
OR (endDate >= CAST(@end AS DATETIME)) AND startDate <= CAST(@end AS DATETIME)) 

應該匹配你想要的一切。它匹配記錄在start或end上的所有記錄。如果你想要匹配start或end中包含的所有內容，但不要與它們中的任何一個重疊，也許你必須將它們結合起來。

Answer 2

你要做

SELECT * FROM events 
WHERE (startDate <= CAST(@end AS DATETIME) AND endDate >= CAST(@start AS DATETIME)