Oracle to_char的一些功能记录。1、转成年月日时分秒的操作;2、转成微妙的操作SQL> select to_char(systimestamp, "yyyy-mm-dd-hh24:mi:ss.ff") from dual;
TO_CHAR(SYSTIMESTAMP,"YYYY-MM-
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2013-09-26-16:08:04.234000
注意,没有转成毫秒的参数格式。如果需要转成毫秒,这样操作SQL> select to_char(systimestamp, "yyyy-mm-dd-hh24:mi:ss.ff3") from dual;
TO_CHAR(SYSTIMESTAMP,"YYYY-MM-
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2013-09-26-16:12:10.640 3、转成零点到当前时间的秒数SQL> select to_char(systimestamp, "yyyymmddhh24miss -- SSSSS") from dual;
TO_CHAR(SYSTIMESTAMP,"YYYYMMDD
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20130926160938 -- 58178 SQL> select to_char(systimestamp, "yyyy-mm-dd-hh24:mi:ss"),2 to_char(systimestamp, "yyyymmddhh24miss -- SSSSS"),
3 to_char(systimestamp, "hh24") * 60 * 60 +
4 to_char(systimestamp, "mi") * 60 + to_char(systimestamp, "ss") +
5 to_number(to_char(systimestamp, "ff") / 1000000.00)
6 from dual
7 /
TO_CHAR(SYSTIMESTAMP,"YYYY-MM- TO_CHAR(SYSTIMESTAMP,"YYYYMMDD TO_CHAR(SYSTIMESTAMP,"HH24")*6
------------------------------ ------------------------------ ------------------------------
2013-09-26-16:00:13 20130926160013 -- 57613 57613
相关阅读:Oracle修改默认时间格式 http://www.linuxidc.com/Linux/2012-12/75816.htm修改Oracle SQL Developer的时间格式 http://www.linuxidc.com/Linux/2011-10/45484.htmOracle时间格式转换异常处理函数 http://www.linuxidc.com/Linux/2011-08/39984.htmOracle时间格式化问题 http://www.linuxidc.com/Linux/2011-02/32776.htmOracle如何修改系统默认时间格式 http://www.linuxidc.com/Linux/2010-08/27543.htm 其他参数如下表所示:
| Parameter | Explanation |
|---|
| YEAR | Year, spelled out |
| YYYY | 4-digit year |
YYY YY Y | Last 3, 2, or 1 digit(s) of year. |
IYY IY I | Last 3, 2, or 1 digit(s) of ISO year. |
| IYYY | 4-digit year based on the ISO standard |
| Q | Quarter of year (1, 2, 3, 4; JAN-MAR = 1). |
| MM | Month (01-12; JAN = 01). |
| MON | Abbreviated name of month. |
| MONTH | Name of month, padded with blanks to length of 9 characters. |
| RM | Roman numeral month (I-XII; JAN = I). |
| WW | Week of year (1-53) where week 1 starts on the first day of the year and continues to the seventh day of the year. |
| W | Week of month (1-5) where week 1 starts on the first day of the month and ends on the seventh. |
| IW | Week of year (1-52 or 1-53) based on the ISO standard. |
| D | Day of week (1-7). |
| DAY | Name of day. |
| DD | Day of month (1-31). |
| DDD | Day of year (1-366). |
| DY | Abbreviated name of day. |
| J | Julian day; the number of days since January 1, 4712 BC. |
| HH | Hour of day (1-12). |
| HH12 | Hour of day (1-12). |
| HH24 | Hour of day (0-23). |
| MI | Minute (0-59). |
| SS | Second (0-59). |
| SSSSS | Seconds past midnight (0-86399). |
| FF | Fractional seconds. |
其他语言objective-c的date格式转换,参考http://userguide.icu-project.org/formatparse/datetime 更新Oracle数据时遇到锁死情况的处理Oracle RAC 10g 升级到11g (out of place) 回退方案相关资讯 Oracle to_char Oracle时间格式转换
- Oracle基础教程:函数to_char将 (11/30/2012 12:00:26)
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