我需要使用CUBE分组功能以获得所有可能的组合，以便可以在APEX上使用此报告，其中参数控制报告的查看方式。我的完整查询太复杂，无法显示，可能只是混淆了这种情况。这里我有缩减版
Select /*+ NO_PARALLEL */ ETP_ETPC_UID,
Decode (Grouping(ETP_ET_UID), 1, '-Grouped-', ETP_ET_UID),
/* Decode (Grouping(ETP_ET_UID), 1, '-Grouped-', ET_ABBR), */
Decode (Grouping(ETP_REFERENCE_1), 1, '-Grouped-', ETP_REFERENCE_1),
Decode (Grouping(ETP_REFERENCE_2), 1, '-Grouped-', ETP_REFERENCE_2),
Sum(ETP_COUNT)
From ETP_PROFILE,
ET_EVENT_TYPE
Where ETP_ET_UID = ET_UID
Group By
ETP_ETPC_UID,
Cube( /*(*/ETP_ET_UID/*, ET_ABBR)*/ , ETP_REFERENCE_1, ETP_REFERENCE_2)
我目前遇到的问题与我评论过的部分有关。根据{{3}}，复合列意味着被视为1，非常好，我可以在我的查询中使用ET_ABBR并将ET_UID和ET_ABBR设置为复合（取消注释我的代码，您将看到）。
当我这样做时，它似乎荒谬地增加了查询的成本（根据解释计划），实际上它需要永远运行。如果我删除了我的ET_ABBR列（现在代码是如何使用注释的），它加载速度非常快，解释计划成本很高。
我在这里做错了，我应该使用分组集还是类似的东西？这是我第一次搞乱这些特殊的分组命令，它们看起来很好，但很混乱。
编辑： 解释评论查询的计划：
Plan hash value: 3169115854
------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 142K| 9M| 408 (3)| 00:00:05 | | |
| 1 | SORT GROUP BY | | 142K| 9M| 408 (3)| 00:00:05 | | |
| 2 | GENERATE CUBE | | 142K| 9M| 408 (3)| 00:00:05 | | |
| 3 | SORT GROUP BY | | 142K| 9M| 408 (3)| 00:00:05 | | |
| 4 | PARTITION RANGE ALL| | 142K| 9M| 401 (1)| 00:00:05 | 1 |1048575|
| 5 | PARTITION LIST ALL| | 142K| 9M| 401 (1)| 00:00:05 | 1 | 10 |
| 6 | TABLE ACCESS FULL| ETP_PROFILE | 142K| 9M| 401 (1)| 00:00:05 | 1 |1048575|
------------------------------------------------------------------------------------------------------
Note
-----
- dynamic sampling used for this statement (level=2)
解释未评论代码的计划：
Plan hash value: 2063641247
--------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
--------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 54 | 6426 | 427 (4)| 00:00:06 | | |
| 1 | TEMP TABLE TRANSFORMATION | | | | | | | |
| 2 | MULTI-TABLE INSERT | | | | | | | |
| 3 | SORT GROUP BY ROLLUP | | 54 | 4536 | 412 (3)| 00:00:05 | | |
|* 4 | HASH JOIN | | 142K| 11M| 406 (1)| 00:00:05 | | |
| 5 | TABLE ACCESS FULL | ET_EVENT_TYPE | 55 | 605 | 4 (0)| 00:00:01 | | |
| 6 | PARTITION RANGE ALL | | 142K| 9M| 401 (1)| 00:00:05 | 1 |1048575|
| 7 | PARTITION LIST ALL | | 142K| 9M| 401 (1)| 00:00:05 | 1 | 10 |
| 8 | TABLE ACCESS FULL | ETP_PROFILE | 142K| 9M| 401 (1)| 00:00:05 | 1 |1048575|
| 9 | DIRECT LOAD INTO | SYS_TEMP_0FD9D6E6F_E9BC1839 | | | | | | |
| 10 | DIRECT LOAD INTO | SYS_TEMP_0FD9D6E70_E9BC1839 | | | | | | |
| 11 | LOAD AS SELECT | SYS_TEMP_0FD9D6E70_E9BC1839 | | | | | | |
| 12 | SORT GROUP BY ROLLUP | | 54 | 3402 | 3 (34)| 00:00:01 | | |
| 13 | TABLE ACCESS FULL | SYS_TEMP_0FD9D6E6F_E9BC1839 | 54 | 3402 | 2 (0)| 00:00:01 | | |
| 14 | MULTI-TABLE INSERT | | | | | | | |
| 15 | SORT GROUP BY ROLLUP | | 54 | 3240 | 3 (34)| 00:00:01 | | |
| 16 | TABLE ACCESS FULL | SYS_TEMP_0FD9D6E6F_E9BC1839 | 54 | 3240 | 2 (0)| 00:00:01 | | |
| 17 | DIRECT LOAD INTO | SYS_TEMP_0FD9D6E71_E9BC1839 | | | | | | |
| 18 | DIRECT LOAD INTO | SYS_TEMP_0FD9D6E70_E9BC1839 | | | | | | |
| 19 | LOAD AS SELECT | SYS_TEMP_0FD9D6E70_E9BC1839 | | | | | | |
| 20 | SORT GROUP BY ROLLUP | | 54 | 2322 | 3 (34)| 00:00:01 | | |
| 21 | TABLE ACCESS FULL | SYS_TEMP_0FD9D6E71_E9BC1839 | 54 | 2322 | 2 (0)| 00:00:01 | | |
| 22 | VIEW | | 162 | 19278 | 6 (0)| 00:00:01 | | |
| 23 | VIEW | | 162 | 15066 | 6 (0)| 00:00:01 | | |
| 24 | UNION-ALL | | | | | | | |
| 25 | TABLE ACCESS FULL | SYS_TEMP_0FD9D6E6F_E9BC1839 | 54 | 4536 | 2 (0)| 00:00:01 | | |
| 26 | TABLE ACCESS FULL | SYS_TEMP_0FD9D6E70_E9BC1839 | 54 | 4536 | 2 (0)| 00:00:01 | | |
| 27 | TABLE ACCESS FULL | SYS_TEMP_0FD9D6E71_E9BC1839 | 54 | 3240 | 2 (0)| 00:00:01 | | |
--------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("SYS_TBL_$2$"."ETP_ET_UID"="SYS_TBL_$1$"."ET_UID")
Note
-----
- dynamic sampling used for this statement (level=2)