RE: Can you execute a function in an Oracle comment/hint?
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 4 May 2007 13:25:40 -0700
This isn't exactly what I had in mind, and I think it will only work in
SQL*Plus, but it's getting close:
SQL> alter session set nls_date_format = 'DD-MON-YY hh24:mi:ss';
Session altered.
SQL> select /*+ &_DATE */ 1 from dual;
old 1: select /*+ &_DATE */ 1 from dual
new 1: select /*+ 04-MAY-07 13:20:25 */ 1 from dual
1
----------
1
SQL> select hash_value, sql_text from v$sql where sql_text like '%1 from
dual';
HASH_VALUE SQL_TEXT
----------
---------------------------------------------------------------------
2312264275 select /*+ 04-MAY-07 13:20:25 */ 1 from dual
SQL> select /*+ &_DATE */ 1 from dual;
old 1: select /*+ &_DATE */ 1 from dual
new 1: select /*+ 04-MAY-07 13:24:25 */ 1 from dual
1
----------
1
SQL> select hash_value, sql_text from v$sql where sql_text like '%1 from
dual';
HASH_VALUE SQL_TEXT
----------
--------------------------------------------------------------------
2312264275 select /*+ 04-MAY-07 13:20:25 */ 1 from dual
4293063447 select /*+ 04-MAY-07 13:24:25 */ 1 from dual
This could also be done with _USER, or any of the other 8 predefined
variables, as described below, but _DATE is the only one that can give a
unique hash_value every time:
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14357/ch12
017.htm#sthref2145
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