oracle - 棘手的Oracle解析函数问题

Question

我是 Oracle 分析函数的新手，我正在尝试找到编写查询的最佳方法。

以下是我正在使用的表格的简化版本...

CREATE TABLE my_table
(
    pid          NUMBER  NOT NULL,
    my_value     NUMBER,
    value_date   DATE    NOT NULL,

    CONSTRAINT pk_my_table PRIMARY KEY (pid, value_date)
);

请注意，“value_date”是主键的一部分。

对于每个“pid”，我希望查询显示 5 列:
1.pid
2.“my_value”最近7天数据的最大值
3. 最长 7 天的相应日期 (value_date)
4.“my_value”最近30天数据的最大值
5. 最长 30 天的相应日期 (value_date)

是否可以在不加入的情况下执行此操作？实现这一目标的最佳方法是什么？

预先感谢您的帮助，

卡尔

Answer 1

我无法在这里得到我正在寻找的答案，所以我在 Oracle 论坛上发布了这个问题。我得到的答案正是我正在寻找的。以下查询仅通过表一次且没有任何联接即可获得答案...

  SELECT   pid,
           MAX(CASE
                  WHEN value_date > TRUNC (SYSDATE) - 6 THEN my_value
                  ELSE 0
               END)
              max_7_days,
           MAX(value_date)
              KEEP (DENSE_RANK FIRST ORDER BY
                                        (CASE
                                            WHEN value_date >
                                                    TRUNC (SYSDATE) - 6
                                            THEN
                                               my_value
                                            ELSE
                                               0
                                         END) DESC)
              day_7_days,
           MAX(CASE
                  WHEN value_date > TRUNC (SYSDATE) - 29 THEN my_value
                  ELSE 0
               END)
              max_30_days,
           MAX(value_date)
              KEEP (DENSE_RANK FIRST ORDER BY
                                        CASE
                                           WHEN value_date >
                                                   TRUNC (SYSDATE) - 29
                                           THEN
                                              my_value
                                           ELSE
                                              0
                                        END DESC)
              day_30_days
    FROM   my_table
GROUP BY   pid;

如果有人想测试它，这里有一些示例数据。

INSERT INTO my_table (pid, my_value, value_date) VALUES (1,    300, '18-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,    200, '17-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   4500, '16-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,    800, '15-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  12000, '14-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  21000, '13-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   5600, '12-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  18400, '11-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   7200, '10-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  24000, '09-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   8800, '08-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   6000, '07-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  44200, '06-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   2800, '05-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  58500, '04-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   8000, '03-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  30600, '02-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   7200, '01-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  62700, '31-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  48000, '30-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  16800, '29-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  83600, '28-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  18400, '27-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  16800, '26-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  40000, '25-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  23400, '24-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  99900, '23-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  67200, '22-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   5800, '21-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  57000, '20-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  96100, '19-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  64000, '18-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  52800, '17-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  71400, '16-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  14000, '15-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,   7200, '14-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1, 111000, '13-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  64600, '12-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1, 113100, '11-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (1,  84000, '10-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,   6000, '18-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,   7800, '17-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,  13500, '16-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,  25600, '15-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 276000, '14-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 210000, '13-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 162400, '12-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,  36800, '11-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,  86400, '10-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 480000, '09-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,   8800, '08-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 102000, '07-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,1237600, '06-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,  61600, '05-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,1287000, '04-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 144000, '03-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 275400, '02-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,  93600, '01-FEB-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,1630200, '31-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,1248000, '30-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 235200, '29-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,3176800, '28-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,  73600, '27-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 403200, '26-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 200000, '25-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 280800, '24-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 599400, '23-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,1612800, '22-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 110200, '21-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,1653000, '20-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,2498600, '19-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,2368000, '18-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 211200, '17-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,2570400, '16-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 224000, '15-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 223200, '14-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2, 999000, '13-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,2325600, '12-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,1017900, '11-JAN-10');
INSERT INTO my_table (pid, my_value, value_date) VALUES (2,2352000, '10-JAN-10');

感谢大家为回答这个问题所做的努力!

卡尔