http://www.anysql.net/dba/why_extra_space_char.html Oracle DBA,MySQL DBA, 数据恢复, 数据迁移, 报表软件, 性能优化, 系统监控 Wed, 17 Mar 2010 15:20:08 +0000 http://wordpress.org/?v=2.9.2 hourly 1 http://www.anysql.net/dba/why_extra_space_char.html/comment-page-1#comment-1388 冰冻奶茶 Tue, 15 Jan 2008 18:34:13 +0000 http://www.anysql.net/wordpress/uncategorized/%e4%b8%ba%e4%bb%80%e4%b9%88%e5%a4%9a%e4%ba%86%e4%b8%80%e4%b8%aa%e7%a9%ba%e6%a0%bc.html#comment-1388 SQL> select dump(to_char(9,'99')) from dual; DUMP(TO_CHAR(9,'99')) ---------------------------------------------------------------------------------------------------- Typ=1 Len=3: 32,32,57 应该是用0来补位吧 SQL> select dump(to_char(9,’99′)) from dual;
DUMP(TO_CHAR(9,’99′))
—————————————————————————————————-
Typ=1 Len=3: 32,32,57
应该是用0来补位吧

]]> http://www.anysql.net/dba/why_extra_space_char.html/comment-page-1#comment-1387 niubro Sat, 12 Jan 2008 02:12:35 +0000 http://www.anysql.net/wordpress/uncategorized/%e4%b8%ba%e4%bb%80%e4%b9%88%e5%a4%9a%e4%ba%86%e4%b8%80%e4%b8%aa%e7%a9%ba%e6%a0%bc.html#comment-1387 不错，转载了 不错，转载了

]]> http://www.anysql.net/dba/why_extra_space_char.html/comment-page-1#comment-1386 anysql Fri, 11 Jan 2008 19:43:19 +0000 http://www.anysql.net/wordpress/uncategorized/%e4%b8%ba%e4%bb%80%e4%b9%88%e5%a4%9a%e4%ba%86%e4%b8%80%e4%b8%aa%e7%a9%ba%e6%a0%bc.html#comment-1386 谢谢adam的精彩回答. 谢谢adam的精彩回答.

]]> http://www.anysql.net/dba/why_extra_space_char.html/comment-page-1#comment-1385 adam Fri, 11 Jan 2008 19:23:28 +0000 http://www.anysql.net/wordpress/uncategorized/%e4%b8%ba%e4%bb%80%e4%b9%88%e5%a4%9a%e4%ba%86%e4%b8%80%e4%b8%aa%e7%a9%ba%e6%a0%bc.html#comment-1385 SQL> SELECT 'P'||TO_CHAR(9,'FM09') FROM DUAL; 'P'| ---- P09 SQL> SELECT DUMP(TO_CHAR(9,'FM09')) coldump from dual; COLDUMP -------------------------------------------------------------------------------- Typ=1 Len=2: 48,57 FM Fill mode. Oracle uses blank characters to fill format elements to a constant width equal to the largest element for the relevant format model in the current session language. For example, when NLS_LANGUAGE is AMERICAN, the largest element for MONTH is SEPTEMBER, so all values of the MONTH format element are padded to 9 display characters. This modifier suppresses blank padding in the return value of the TO_CHAR function: In a datetime format element of a TO_CHAR function, this modifier suppresses blanks in subsequent character elements (such as MONTH) and suppresses leading zeroes for subsequent number elements (such as MI) in a date format model. Without FM, the result of a character element is always right padded with blanks to a fixed length, and leading zeroes are always returned for a number element. With FM, which suppresses blank padding, the length of the return value may vary. In a number format element of a TO_CHAR function, this modifier suppresses blanks added to the left of the number, so that the result is left-justified in the output buffer. Without FM, the result is always right-justified in the buffer, resulting in blank-padding to the left of the number. SQL> SELECT ‘P’||TO_CHAR(9,’FM09′) FROM DUAL;
‘P’|
—-
P09
SQL> SELECT DUMP(TO_CHAR(9,’FM09′)) coldump from dual;
COLDUMP
——————————————————————————–
Typ=1 Len=2: 48,57
FM
Fill mode. Oracle uses blank characters to fill format elements to a constant width equal to the largest element for the relevant format model in the current session language. For example, when NLS_LANGUAGE is AMERICAN, the largest element for MONTH is SEPTEMBER, so all values of the MONTH format element are padded to 9 display characters. This modifier suppresses blank padding in the return value of the TO_CHAR function:
In a datetime format element of a TO_CHAR function, this modifier suppresses blanks in subsequent character elements (such as MONTH) and suppresses leading zeroes for subsequent number elements (such as MI) in a date format model. Without FM, the result of a character element is always right padded with blanks to a fixed length, and leading zeroes are always returned for a number element. With FM, which suppresses blank padding, the length of the return value may vary.
In a number format element of a TO_CHAR function, this modifier suppresses blanks added to the left of the number, so that the result is left-justified in the output buffer. Without FM, the result is always right-justified in the buffer, resulting in blank-padding to the left of the number.

]]> http://www.anysql.net/dba/why_extra_space_char.html/comment-page-1#comment-1384 anysql Fri, 11 Jan 2008 17:30:34 +0000 http://www.anysql.net/wordpress/uncategorized/%e4%b8%ba%e4%bb%80%e4%b9%88%e5%a4%9a%e4%ba%86%e4%b8%80%e4%b8%aa%e7%a9%ba%e6%a0%bc.html#comment-1384 后来是那样解决的, 只是从来没有注意到过这个问题, 从DATE向CHAR转换的多, 为NUMBER指定格式情况的很少. 后来是那样解决的, 只是从来没有注意到过这个问题, 从DATE向CHAR转换的多, 为NUMBER指定格式情况的很少.

]]> http://www.anysql.net/dba/why_extra_space_char.html/comment-page-1#comment-1383 eygle Fri, 11 Jan 2008 17:18:18 +0000 http://www.anysql.net/wordpress/uncategorized/%e4%b8%ba%e4%bb%80%e4%b9%88%e5%a4%9a%e4%ba%86%e4%b8%80%e4%b8%aa%e7%a9%ba%e6%a0%bc.html#comment-1383 trim或ltrim一下 trim或ltrim一下

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