如何在同一列或不同勢列一個SQL語句中使用「之間」 condetion兩次

Question

這是SQL語句，只給出一個值

SELECT count(pn1) FROM pledges 
WHERE date1 
BETWEEN '2011-05-05' AND '2011-06-06' 

我想用「之間的」一個以上的時間同一列或者在同一個表

不同的列例如，我想在DATE1超過一次使用它，或者我想使用它的日期1和date2不同範圍

注：我使用的Java DB Derpy（JDBC - 德比）

Answer 1

不止一次爲同一列：

SELECT count(pn1) 
    FROM pledges 
    WHERE date1 BETWEEN '2011-05-05' AND '2011-06-06' 
     OR date1 BETWEEN '2011-07-05' AND '2011-08-06' 

兩個不同的列：

SELECT count(pn1) 
    FROM pledges 
    WHERE date1 BETWEEN '2011-05-05' AND '2011-06-06' 
     AND date2 BETWEEN '2011-05-05' AND '2011-06-06' 

編輯：根據評論，也許您正在尋找這樣的事情呢？

SELECT SUM(CASE WHEN date1 BETWEEN '2011-05-05' AND '2011-06-06' THEN 1 ELSE 0) END AS Count1, 
     SUM(CASE WHEN date1 BETWEEN '2011-07-05' AND '2011-08-06' THEN 1 ELSE 0) END AS Count2 
    FROM pledges 
    WHERE date1 BETWEEN '2011-05-05' AND '2011-06-06' 
     OR date1 BETWEEN '2011-07-05' AND '2011-08-06'