嘗試查找不同的數據時得到相同的結果

我可以從下面的查詢中獲得每年的15/02 - 21/06日期範圍數據。嘗試查找不同的數據時得到相同的結果

SELECT * FROM dim_date 
WHERE EXTRACT (MONTH FROM date_cal) BETWEEN 3 AND 5 
OR (EXTRACT (MONTH FROM date_cal) = 2 AND EXTRACT (DAY FROM date_cal) >= 15) 
OR (EXTRACT (MONTH FROM date_cal) = 6 AND EXTRACT (DAY FROM date_cal) <= 21)

但問題是，當我想從去年2010 - 2012找到，我回來了相同的結果。

範圍，我想：

2010-02-15 - 2010-06-15 
2011-02-15 - 2011-06-15 
2012-02-15 - 2012-06-15 

SELECT * FROM dim_date 
WHERE EXTRACT (MONTH FROM date_cal) BETWEEN 3 AND 5 
OR (EXTRACT (MONTH FROM date_cal) = 2 AND EXTRACT (DAY FROM date_cal) >= 15) 
OR (EXTRACT (MONTH FROM date_cal) = 6 AND EXTRACT (DAY FROM date_cal) <= 21) 
AND EXTRACT (YEAR FROM date_cal) BETWEEN 2010 AND 2012

誰能幫我這個！

來源

2012-08-15 tommy5115

考慮[後續問題與更多答案]（http://stackoverflow.com/q/11944762/939860）。 [與這個主題相關的更多問題]（http://stackoverflow.com/questions/15169410/how-do-you-do-date-math-that-ignores-the-year/15179731）。 – 2013-05-02 23:32:27

你的問題是缺乏括號：在SQL AND優先OR，所以你需要把周圍的整個前一個表達式括號：

SELECT * FROM dim_date 
WHERE (-- added bracket 
EXTRACT (MONTH FROM date_cal) BETWEEN 3 AND 5 
OR (EXTRACT (MONTH FROM date_cal) = 2 AND EXTRACT (DAY FROM date_cal) >= 15) 
OR (EXTRACT (MONTH FROM date_cal) = 6 AND EXTRACT (DAY FROM date_cal) <= 21) 
) -- added bracket 
AND EXTRACT (YEAR FROM date_cal) BETWEEN 2010 AND 2012

如果沒有括號，你A or B or (C and D)，但你要(A or B or C) and D

來源

2012-08-15 03:08:48 Bohemian

@ muistooshort嗯，是的。謝謝。編輯。 – Bohemian 2012-08-15 04:00:26

嘗試查找不同的數據時得到相同的結果

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