根据您的要求,看起来您的日期是在2011年,而不是2010年。另外我在1月份添加了一行,以确保获取样本数据上个月的最后一行。
SQL> WITH DATA AS (
2 SELECT 1 id, to_date('1-1-2011', 'dd-mm-yyyy') Price_date, 19.5 price
3 FROM DUAL
4 UNION ALL SELECT 1, to_date('31-1-2011', 'dd-mm-yyyy'), 20 FROM DUAL
5 UNION ALL SELECT 1, to_date('2-2-2011', 'dd-mm-yyyy'), 21 FROM DUAL
6 UNION ALL SELECT 1, to_date('7-2-2011', 'dd-mm-yyyy'), 22 FROM DUAL
7 UNION ALL SELECT 1, to_date('27-2-2011', 'dd-mm-yyyy'), 23 FROM DUAL
8 UNION ALL SELECT 1, to_date('3-3-2011', 'dd-mm-yyyy'), 23 FROM DUAL
9 )
10 SELECT ID,
11 MAX(price_date) price_date,
12 MAX(price) KEEP (DENSE_RANK FIRST ORDER BY price_date DESC)
13 /MAX(price)
14 KEEP (DENSE_RANK FIRST
15 ORDER BY CASE WHEN price_date < trunc(SYSDATE, 'month')
16 THEN price_date END
17 DESC NULLS LAST) - 1 RETURN,
18 add_months(trunc(SYSDATE, 'month'), 1) last_date_for_return_calc
19 FROM DATA
20 WHERE price_date >= add_months(trunc(SYSDATE, 'month'), -1)
21 AND price_date < add_months(trunc(SYSDATE, 'month'), 1)
22 GROUP BY ID;
ID PRICE_DATE RETURN LAST_DATE_FOR_RETURN_CALC
---------- ----------- ---------- -------------------------
1 27/02/2011 0,15 01/03/2011
您能否解释1-3-2011的last_date_for_return_calculation来自哪里?我没有看到你的样本数据。也许今年刚刚结束呢? – kbrimington 2011-02-01 13:57:57
正如我在问题中写的那样,这将是下个月的第一天。 – awsome 2011-02-01 14:02:06
“last_price_of_month”是什么意思?哪个月?哪一年? – bluish 2011-02-01 14:13:24