IF條件SQL查詢的WHERE子句中

Question

我的Oracle SQL查詢這樣

SELECT * 
FROM test 
WHERE 1 =1 
AND req_no IN 
    (SELECT req_no 
    FROM test 
    WHERE date1 IS NOT NULL 
    AND date1 BETWEEN '1-JUN-12' AND '30-JUN-12' 
) 

的問題是WHERE條件不能正常工作。在上述情況下，如果'date1' 不是NULL，那麼我想檢查'FROM'和'TO'日期之間的'date1'。 * 編輯 * 我已經加入樣品表數據

Test table 
From date: 1-JUN-2012 
To date: 30-JUN-2012 

record  date1   date2   date3 
1  12-JUN-2012  13-JUN-2012   12-JUN-2012 
2  null   null    12-JUN-2012 
3  null   3-JUN-2012   null 
4  12-JUN-2012  null    null 
5  12-JUN-2012  13-JUL-2012   12-JUN-2012 
6  null    null    null 

在上面的記錄將返回記錄數= 1,2,3,4不第六紀錄。

Answer 1

您可以使用OR這樣的：

WHERE date1 IS NULL 
    OR date1 BETWEEN '1-JUN-12' AND '30-JUN-12' 

你的整個查詢應該是：

SELECT * 
FROM test 
WHERE 1 =1 
AND req_no IN 
    (SELECT req_no 
    FROM test 
    WHERE date1 IS NULL 
    OR date1 BETWEEN '1-JUN-12' AND '30-JUN-12' 
) 

Answer 2

的1=1是多餘的。既然你說你想檢查是否date1的是日期的範圍之間，或者如果它是零，也沒關係，試試：

SELECT * 
FROM test 
WHERE req_no IN 
    (SELECT req_no 
    FROM test 
    WHERE date1 BETWEEN to_date('06/01/2012','mm/dd/yyyy') 
     AND to_date('06/30/2012','mm/dd/yyyy') 
     OR date1 is null 
) 

Answer 3

我認爲你不需要子查詢，你可以使用單個查詢 直接選擇您的相關記錄像還你不需要檢查date1爲空或不是

SELECT * FROM test 
    WHERE TO_DATE('12/2/2003','MM/DD/YYYY') <= date1 
AND TO_DATE('12/5/2003','MM/DD/YYYY') >= date1 

Answer 4

找到了一些解決方法，但它是非常漫長的

SELECT * 
FROM dates 
WHERE 1 =1 
AND( 
    no IN 
    (SELECT no FROM dates WHERE date1 BETWEEN '1-JUN-12' AND '30-JUN-12' 
    and date2 is null and date3 is null) 
    or 
    no IN 
    (SELECT no FROM dates WHERE date2 BETWEEN '1-JUN-12' AND '30-JUN-12' 
    and date1 is null and date3 is null) 
    or 
    no IN 
    (SELECT no FROM dates WHERE date3 BETWEEN '1-JUN-12' AND '30-JUN-12' 
    and date1 is null and date2 is null) 
    or 
    no IN 
    (SELECT no FROM dates WHERE date3 BETWEEN '1-JUN-12' AND '30-JUN-12' 
    and date1 BETWEEN '1-JUN-12' AND '30-JUN-12' and date2 BETWEEN '1-JUN-12' AND '30-JUN-12') 
    or 
    no IN 
    (SELECT no FROM dates WHERE date1 BETWEEN '1-JUN-12' AND '30-JUN-12' 
    and date1 BETWEEN '1-JUN-12' AND '30-JUN-12' and date3 is null) 
    or 
    no IN 
    (SELECT no FROM dates WHERE date3 BETWEEN '1-JUN-12' AND '30-JUN-12' 
    and date3 BETWEEN '1-JUN-12' AND '30-JUN-12' and date2 is null) 
    or 
    no IN 
    (SELECT no FROM dates WHERE date2 BETWEEN '1-JUN-12' AND '30-JUN-12' 
    and date3 BETWEEN '1-JUN-12' AND '30-JUN-12' and date1 is null) 

)