Mysql date_format 与 Oracle to_char(date,’format’)
Mysql date_format 与 Oracle to_char(date,’format’)
以上2种方法均属于把事件类型的列，转换成你所需要的时间格式的函数。
Oracle: select to_char(zatime,'yyyymmdd hh24:mi:ss') from downloaddata where to_char(zatime,'yyyymmdd hh24:mi:ss')>'20120405 23:15:18' and rownum <5;
TO_CHAR(ZATIME,'YYYYMMDDHH24:M
------------------------------
20120406 12:15:30
20120406 12:16:04
20120406 12:16:08
20120406 12:17:17
Mysql: select date_format(CreateDate,'%Y%m%d %H:%i:%s') from tbl_RelatedArticle where date_format(CreateDate,'%Y%m%d %H:%i:%s') >= '20120506 11:58:12' limit 4;
date_format(CreateDate,'%Y%m%d %H:%i:%s')
'20120507 10:51:47'
'20120507 10:52:02'
'20120507 15:20:00'
'20120508 10:13:32'
上面的2个例子应该基本上可以了解 date_format的功能，其实还有一些功能这里暂时不介绍了。下面介绍一下官档中的描述。
（总结：今天也了解了一下MYSQL 查询中以时间为标准分割查询。）
官档链接
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date-format
- DATE_FORMAT(date,format)
Formats the date value according to the format string.
The following specifiers may be used in the format string. The “%” character is required before format specifier characters.
| Specifier |
Description |
| %a |
Abbreviated weekday name (Sun..Sat) |
| %b |
Abbreviated month name (Jan..Dec) |
| %c |
Month, numeric (0..12) |
| %D |
Day of the month with English suffix (0th, 1st, 2nd, 3rd, …) |
| %d |
Day of the month, numeric (00..31) |
| %e |
Day of the month, numeric (0..31) |
| %f |
Microseconds (000000..999999) |
| %H |
Hour (00..23) |
| %h |
Hour (01..12) |
| %I |
Hour (01..12) |
| %i |
Minutes, numeric (00..59) |
| %j |
Day of year (001..366) |
| %k |
Hour (0..23) |
| %l |
Hour (1..12) |
| %M |
Month name (January..December) |
| %m |
Month, numeric (00..12) |
| %p |
AM or PM |
| %r |
Time, 12-hour (hh:mm:ss followed by AM or PM) |
| %S |
Seconds (00..59) |
| %s |
Seconds (00..59) |
| %T |
Time, 24-hour (hh:mm:ss) |
| %U |
Week (00..53), where Sunday is the first day of the week |
| %u |
Week (00..53), where Monday is the first day of the week |
| %V |
Week (01..53), where Sunday is the first day of the week; used with %X |
| %v |
Week (01..53), where Monday is the first day of the week; used with %x |
| %W |
Weekday name (Sunday..Saturday) |
| %w |
Day of the week (0=Sunday..6=Saturday) |
| %X |
Year for the week where Sunday is the first day of the week, numeric, four digits; used with %V |
| %x |
Year for the week, where Monday is the first day of the week, numeric, four digits; used with %v |
| %Y |
Year, numeric, four digits |
| %y |
Year, numeric (two digits) |
| %% |
A literal “%” character |
| %x |
x, for any “x” not listed above |
Ranges for the month and day specifiers begin with zero due to the fact that MySQL permits the storing of incomplete dates such as '2014-00-00'.
The language used for day and month names and abbreviations is controlled by the value of the lc_time_names system variable (Section 10.7, “MySQL Server Locale Support”).
DATE_FORMAT() returns a string with a character set and collation given by character_set_connection and collation_connection so that it can return month and weekday names containing non-ASCII characters.
mysql> SELECT DATE_FORMAT('2009-10-04 22:23:00', '%W %M %Y');
-> 'Sunday October 2009'
mysql> SELECT DATE_FORMAT('2007-10-04 22:23:00', '%H:%i:%s');
-> '22:23:00'
mysql> SELECT DATE_FORMAT('1900-10-04 22:23:00',
-> '%D %y %a %d %m %b %j');
-> '4th 00 Thu 04 10 Oct 277'
mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00',
-> '%H %k %I %r %T %S %w');
-> '22 22 10 10:23:00 PM 22:23:00 00 6'
mysql> SELECT DATE_FORMAT('1999-01-01', '%X %V');
-> '1998 52'
mysql> SELECT DATE_FORMAT('2006-06-00', '%d');
-> '00'
oracle ：ROUND ，TRUNC，TO_CHAR 分割时间查询。
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