Oracle数据库日期输出格式

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在Oracle数据库里, 可以使用
to_char( 日期, 格式 )
函数来对日期进行格式化输出.
示例:
select to_char( sysdate, 'FMyyyy-mm-dd day hh24:mi:ss' ) from dual;FM 表示去掉多余的 0
24 表示采用24小时制
来个中文版的:
select to_char( sysdate, 'yyyy' )
|| '年'
|| to_char( sysdate, 'mm' )
|| '月'
|| to_char( sysdate, 'dd' )
|| '日 星期'
|| (case when to_char(sysdate,'d')='1' then '日'  when to_char(sysdate,'d')='2' then '一'  when to_char(sysdate,'d')='3' then '二'  when to_char(sysdate,'d')='4' then '三'  when to_char(sysdate,'d')='5' then '四'  when to_char(sysdate,'d')='6' then '五'  when to_char(sysdate,'d')='7' then '六' else '' end)
|| ' '
|| to_char( sysdate, 'hh' )
|| '点'
|| to_char( sysdate, 'mi' )
|| '分'
|| to_char( sysdate, 'ss' )
|| '秒' 中文日期
from dual;如果把NLS设成中国，月份和星期几直接输出名字就可以得到相应的中文
参数列表

Parameter	Explanation
YEAR	Year, spelled out
YYYY	4-digit year
YYY	Last 3 digits of year.
YY	Last 2 digits of year.
Y	Last 1 digit of year.
IYY	Last 3 digits of ISO year.
IY	Last 2 digits of ISO year.
I	Last 1 digit 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.