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BlogJava-apple0668-随笔分类-oraclehttp://www.blogjava.net/apple0668/category/35166.html上善若水，水善利万物而不争，处众人之所恶而不争，故几于道——《老子》zh-cnMon, 13 Oct 2008 14:21:05 GMTMon, 13 Oct 2008 14:21:05 GMT60<转>Oracle中常用的to_Char用法详解（有FMT的详细列表）http://www.blogjava.net/apple0668/archive/2008/10/13/234110.htmlapple0668apple0668Mon, 13 Oct 2008 13:48:00 GMThttp://www.blogjava.net/apple0668/archive/2008/10/13/234110.htmlhttp://www.blogjava.net/apple0668/comments/234110.htmlhttp://www.blogjava.net/apple0668/archive/2008/10/13/234110.html#Feedback0http://www.blogjava.net/apple0668/comments/commentRss/234110.htmlhttp://www.blogjava.net/apple0668/services/trackbacks/234110.html以下内容转自网络，感觉这个比较有用。收藏一下。

The following are number examples for the to_char function.

to_char(1210.73, '9999.9') would return '1210.7'

to_char(1210.73, '9,999.99') would return '1,210.73'

to_char(1210.73, '$9,999.00') would return '$1,210.73'

to_char(21, '000099') would return '000021'

The following is a list of valid parameters when the to_char function is used to convert a date to a string. These parameters can be used in many combinations.

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.

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.

The following are date examples for the to_char function.

to_char(sysdate, 'yyyy/mm/dd'); would return '2003/07/09'

to_char(sysdate, 'Month DD, YYYY'); would return 'July 09, 2003'

to_char(sysdate, 'FMMonth DD, YYYY'); would return 'July 9, 2003'

to_char(sysdate, 'MON DDth, YYYY'); would return 'JUL 09TH, 2003'

to_char(sysdate, 'FMMON DDth, YYYY'); would return 'JUL 9TH, 2003'

to_char(sysdate, 'FMMon ddth, YYYY'); would return 'Jul 9th, 2003'

You will notice that in some examples, the format_mask parameter begins with "FM". This means that zeros and blanks are suppressed. This can be seen in the examples below.

to_char(sysdate, 'FMMonth DD, YYYY'); would return 'July 9, 2003'

to_char(sysdate, 'FMMON DDth, YYYY'); would return 'JUL 9TH, 2003'

to_char(sysdate, 'FMMon ddth, YYYY'); would return 'Jul 9th, 2003'

The zeros have been suppressed so that the day component shows as "9" as opposed to "09".

Oracle函数to_char转化数字型指定小数点位数的用法

to_char，函数功能，就是将数值型或者日期型转化为字符型。

比如最简单的应用：

/*1.0123--->'1.0123'*/
Select TO_CHAR(1.0123) FROM DUAL
/*123--->'123'*/
Select TO_CHAR(123) FROM DUAL

接下来再看看下面�

to_char(1210.73, '9999.9')	would return '1210.7'
to_char(1210.73, '9,999.99')	would return '1,210.73'
to_char(1210.73, '$9,999.00')	would return '$1,210.73'
to_char(21, '000099')	would return '000021'

to_char(sysdate, 'yyyy/mm/dd');	would return '2003/07/09'
to_char(sysdate, 'Month DD, YYYY');	would return 'July 09, 2003'
to_char(sysdate, 'FMMonth DD, YYYY');	would return 'July 9, 2003'
to_char(sysdate, 'MON DDth, YYYY');	would return 'JUL 09TH, 2003'
to_char(sysdate, 'FMMON DDth, YYYY');	would return 'JUL 9TH, 2003'
to_char(sysdate, 'FMMon ddth, YYYY');	would return 'Jul 9th, 2003'