在Oracle中，命令和对象名称都是大小写不敏感的，因为Oracle在处理语句时，将所有的名称和命令全部转化为大写。但是对于字符串中的字符，无论是比较还是排序，都是大......
1 - filter(NLSSORT("NAME",'nls_sort=''BINARY_CI''')=HEXTORAW('6100')
)
Note
-----
- dynamic sampling used for this statement
这个情况，可以考虑建立一个函数索引来解决问题：
SQL> CREATE INDEX IND_T_L_NAME ON T(NLSSORT(NAME, 'NLS_SORT=BINARY_CI'));
索引已创建。
SQL> SELECT * FROM T WHERE NAME = 'A';
NAME
------------------------------
A
a
执行计划
----------------------------------------------------------
Plan hash value: 242883967
--------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 17 | 2 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| T | 1 | 17 | 2 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | IND_T_L_NAME | 1 | | 1 (0)| 00:00:01 |
--------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access(NLSSORT("NAME",'nls_sort=''BINARY_CI''')=HEXTORAW('6100') )
Note
-----
- dynamic sampling used for this statement
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