Question

有人可以告诉我下面的oracle查询有什么问题吗？我试图将基于块编号和日期作为常见条件的单列数据导入5个不同的列

提前致谢

select WBD_DATE, WBD_BLOCK_NO, t1.WBD_VALUE, t2.WBD_VALUE, t3.WBD_VALUE,
       t4.WBD_VALUE, t5.WBD_VALUE
from WB_BLOCK_DATA, 
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO
     from WB_BLOCK_DATA
     where WBD_ATTRIBUTE_ID = '2692583'
       and trim(to_char(WBD_DATE, 'Month')) = 'January'
       and to_char(WBD_DATE, 'YYYY')='2017') as t1,
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO
     from WB_BLOCK_DATA
     where WBD_ATTRIBUTE_ID = '2692599'
       and trim(to_char(WBD_DATE, 'Month')) = 'January'
       and to_char(WBD_DATE, 'YYYY')='2017') as t2,
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO
     from WB_BLOCK_DATA
     where WBD_ATTRIBUTE_ID = '2692607'
       and trim(to_char(WBD_DATE, 'Month')) = 'January'
       and to_char(WBD_DATE, 'YYYY')='2017') as t3,
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO
     from WB_BLOCK_DATA
     where WBD_ATTRIBUTE_ID = '2692615'
       and trim(to_char(WBD_DATE, 'Month')) = 'January'
       and to_char(WBD_DATE, 'YYYY')='2017') as t4,
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO
     from WB_BLOCK_DATA
     where WBD_ATTRIBUTE_ID = '2692623'
       and trim(to_char(WBD_DATE, 'Month')) = 'January'
       and to_char(WBD_DATE, 'YYYY')='2017') as t5
where WBD_DATE = t1.WBD_DATE 
  and WBD_DATE = t2.WBD_DATE 
  and WBD_DATE = t3.WBD_DATE 
  and WBD_DATE = t4.WBD_DATE 
  and WBD_DATE = t5.WBD_DATE 
  and WBD_BLOCK_NO = t1.WBD_BLOCK_NO
  and WBD_BLOCK_NO = t2.WBD_BLOCK_NO
  and WBD_BLOCK_NO = t3.WBD_BLOCK_NO
  and WBD_BLOCK_NO = t4.WBD_BLOCK_NO
  and WBD_BLOCK_NO = t5.WBD_BLOCK_NO

Answer 1

Oracle中的表别名不支持

AS，但仅适用于列;此外，您甚至需要为WB_BLOCK_DATA使用别名，或将其列引用为WB_BLOCK_DATA.columnName。

select t0.WBD_DATE, t0.WBD_BLOCK_NO, t1.WBD_VALUE, t2.WBD_VALUE, t3.WBD_VALUE,      t4.WBD_VALUE, t5.WBD_VALUE
from WB_BLOCK_DATA t0, 
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO from WB_BLOCK_DATA where WBD_ATTRIBUTE_ID = '2692583' and trim(to_char(WBD_DATE, 'Month'))='January' and to_char(WBD_DATE, 'YYYY')='2017')  t1,
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO from WB_BLOCK_DATA where WBD_ATTRIBUTE_ID = '2692599' and trim(to_char(WBD_DATE, 'Month'))='January' and to_char(WBD_DATE, 'YYYY')='2017')  t2,
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO from WB_BLOCK_DATA where WBD_ATTRIBUTE_ID = '2692607' and trim(to_char(WBD_DATE, 'Month'))='January' and to_char(WBD_DATE, 'YYYY')='2017')  t3,
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO from WB_BLOCK_DATA where WBD_ATTRIBUTE_ID = '2692615' and trim(to_char(WBD_DATE, 'Month'))='January' and to_char(WBD_DATE, 'YYYY')='2017')  t4,
    (select WBD_VALUE, WBD_DATE, WBD_BLOCK_NO from WB_BLOCK_DATA where WBD_ATTRIBUTE_ID = '2692623' and trim(to_char(WBD_DATE, 'Month'))='January' and to_char(WBD_DATE, 'YYYY')='2017')  t5
    where t0.WBD_DATE = t1.WBD_DATE 
      and t0.WBD_DATE = t2.WBD_DATE 
      and t0.WBD_DATE = t3.WBD_DATE 
      and t0.WBD_DATE = t4.WBD_DATE 
      and t0.WBD_DATE = t5.WBD_DATE 
      and t0.WBD_BLOCK_NO = t1.WBD_BLOCK_NO
      and t0.WBD_BLOCK_NO = t2.WBD_BLOCK_NO
      and t0.WBD_BLOCK_NO = t3.WBD_BLOCK_NO
      and t0.WBD_BLOCK_NO = t4.WBD_BLOCK_NO
      and t0.WBD_BLOCK_NO = t5.WBD_BLOCK_NO

示例：

SQL> select dummy from dual x;

D
-
X

SQL> select dummy from dual as x;
select dummy from dual as x
                       *
ERROR at line 1:
ORA-00933: SQL command not properly ended


SQL> select dummy as d from dual x;

D
-
X

SQL>

Answer 2

作为一个旁边（这实际上太长了，不能作为评论，这就是它的真实情况），你要做的就是称为枢轴操作。如果您使用的是Oracle 11.1或更高版本，则可以使用PIVOT运算符执行此操作：

WITH wb_block_data AS (SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692583' wbd_attribute_id, 10 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692599' wbd_attribute_id, 20 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692607' wbd_attribute_id, 30 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692615' wbd_attribute_id, 40 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692623' wbd_attribute_id, 50 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692671' wbd_attribute_id, 60 wbd_value FROM dual)
-- end of mimicking your table with some sample data in it. See SQL below:
SELECT *
FROM   (SELECT *
        FROM   wb_block_data
        WHERE  wbd_attribute_id IN ('2692583', '2692599', '2692607', '2692615', '2692623')
        and    TRUNC(wbd_date, 'mm') = to_date('01/01/2017', 'dd/mm/yyyy'))
PIVOT (MAX(wbd_value) FOR (wbd_attribute_id) IN ('2692583' AS attrib_2692583,
                                                 '2692599' AS attrib_2692599,
                                                 '2692607' AS attrib_2692607,
                                                 '2692615' AS attrib_2692615,
                                                 '2692623' AS attrib_2692623));

WBD_DATE    WBD_BLOCK_NO ATTRIB_2692583 ATTRIB_2692599 ATTRIB_2692607 ATTRIB_2692615 ATTRIB_2692623
----------- ------------ -------------- -------------- -------------- -------------- --------------
12/01/2017             1             10             20             30             40             50

如果您使用的是早期版本，则可以使用以下方法手动执行数据透视：

WITH wb_block_data AS (SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692583' wbd_attribute_id, 10 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692599' wbd_attribute_id, 20 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692607' wbd_attribute_id, 30 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692615' wbd_attribute_id, 40 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692623' wbd_attribute_id, 50 wbd_value FROM dual UNION ALL
                       SELECT to_date('12/01/2017', 'dd/mm/yyyy') wbd_date, 1 wbd_block_no, '2692671' wbd_attribute_id, 60 wbd_value FROM dual)
-- end of mimicking your table with some sample data in it. See SQL below:
SELECT wbd_date,
       wbd_block_no,
       MAX(CASE WHEN wbd_attribute_id = '2692583' THEN wbd_value END) attrib_2692583,
       MAX(CASE WHEN wbd_attribute_id = '2692599' THEN wbd_value END) attrib_2692599,
       MAX(CASE WHEN wbd_attribute_id = '2692607' THEN wbd_value END) attrib_2692607,
       MAX(CASE WHEN wbd_attribute_id = '2692615' THEN wbd_value END) attrib_2692615,
       MAX(CASE WHEN wbd_attribute_id = '2692623' THEN wbd_value END) attrib_2692623
FROM   wb_block_data
WHERE  wbd_attribute_id IN ('2692583', '2692599', '2692607', '2692615', '2692623')
and    TRUNC(wbd_date, 'mm') = to_date('01/01/2017', 'dd/mm/yyyy')
GROUP BY wbd_date, wbd_block_no;

WBD_DATE    WBD_BLOCK_NO ATTRIB_2692583 ATTRIB_2692599 ATTRIB_2692607 ATTRIB_2692615 ATTRIB_2692623
----------- ------------ -------------- -------------- -------------- -------------- --------------
12/01/2017             1             10             20             30             40             50

请注意，在这两种情况下，我都修改了谓词以将日期与日期进行比较，而不是将日期分成两个字符串然后进行比较。另请注意，我将wbd_date截断为月份级别（自动表示该月的第一天）。这也意味着如果你想使用一个索引，你只需要在一个元素上定义它：trunc(wbd_date, 'mm')而不是两个元素：trim(to_char(WBD_DATE, 'Month'))和to_char(WBD_DATE, 'YYYY')

在oracle中将单个表数据选择为5列列

2 个答案: