如何選擇連續日期？

Question

我有查詢是這樣說：

SELECT DISTINCT 
     S.date1 AS date1, 
     S.date2 AS date2, 
     S.period AS period 

FROM portfolio.scenario S 

WHERE S.date1 >= '2010-06-01' AND 
     S.date2 <= '2010-07-01' AND 
     S.period = 'WEEK' 

輸出是：

"2010-06-01 00:00:00","2010-06-08 00:00:00",WEEK 
"2010-06-02 00:00:00","2010-06-09 00:00:00",WEEK 
"2010-06-03 00:00:00","2010-06-10 00:00:00",WEEK 
"2010-06-04 00:00:00","2010-06-11 00:00:00",WEEK 
"2010-06-07 00:00:00","2010-06-14 00:00:00",WEEK 
"2010-06-08 00:00:00","2010-06-15 00:00:00",WEEK 
"2010-06-09 00:00:00","2010-06-16 00:00:00",WEEK 
"2010-06-10 00:00:00","2010-06-17 00:00:00",WEEK 
"2010-06-11 00:00:00","2010-06-18 00:00:00",WEEK 
"2010-06-14 00:00:00","2010-06-21 00:00:00",WEEK 
"2010-06-15 00:00:00","2010-06-22 00:00:00",WEEK 
"2010-06-16 00:00:00","2010-06-23 00:00:00",WEEK 
"2010-06-17 00:00:00","2010-06-24 00:00:00",WEEK 
"2010-06-18 00:00:00","2010-06-25 00:00:00",WEEK 
"2010-06-21 00:00:00","2010-06-28 00:00:00",WEEK 
"2010-06-22 00:00:00","2010-06-29 00:00:00",WEEK 
"2010-06-23 00:00:00","2010-06-30 00:00:00",WEEK 
"2010-06-24 00:00:00","2010-07-01 00:00:00",WEEK 

我需要的僅僅是連續的日期與最早的日期1 startest;

"2010-06-01 00:00:00","2010-06-08 00:00:00",WEEK 
    "2010-06-08 00:00:00","2010-06-15 00:00:00",WEEK 
    "2010-06-15 00:00:00","2010-06-22 00:00:00",WEEK 
    "2010-06-22 00:00:00","2010-06-29 00:00:00",WEEK 

欣賞的話題:)

Answer 1

這不是最佳的性能，使用功能性條款的任何幫助，但只要S.period保持在一個星期，這將這樣的伎倆。

SELECT DISTINCT 
     S.date1 AS date1, 
     S.date2 AS date2, 
     S.period AS period 

FROM portfolio.scenario S 

WHERE S.date1 >= '2010-06-01' AND 
     S.date2 <= '2010-07-01' AND 
     S.period = 'WEEK' AND 
     DAYOFWEEK(S.date1) = DAYOFWEEK('2010-06-01'); 

Answer 2

編輯 對不起，我沒看你足夠接近期望的結果。該JOIN將整理那些沒有結尾並且在同一天開始的日期。

你需要CROSS JOIN表所示：

SELECT DISTINCT 
     S.date1 AS date1, 
     S.date2 AS date2, 
     S.period AS period 

    FROM portfolio.scenario S, 
     portfolio.scenario T 

WHERE S.date1 >= '2010-06-01' AND 
     S.date2 <= '2010-07-01' AND 
     S.period = 'WEEK' AND 
    (T.date2 = S.date1 OR 
     S.date1 = '2010-06-01') 

最後一個條件需要或者包括第一排，因爲它不能被T.date2 = S.date1結合。

你在這裏。