uppercase
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* String Functions, Numeric Result : *
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ASCII(str) -- ASCII value of str
INSTR(str1, str2 [,num1 [,num2]]) -- position of num2th occurrence of
-- str2 in str1, starting at num1
-- (num1, num2 default to 1)
INSTRB(str1, str2 [,num1 [num2]]) -- same as instr, byte values for num1, num2
LENGTH(str) -- number of characters in str
LENGTHB(str) -- number of bytes in str
NLSSORT(str [,nls_val]) -- nls_val byte value of str
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* SQL Conversion Functions *
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CHARTOROWID(str) -- converts str to ROWID
CONVERT(str, chr_set2 [,chr_set1]) -- converts str to chr_set2
-- chr_set1 default is the datbase character set
HEXTORAW(str) -- converts hex string value to internal raw values
RAWTOHEX(raw_val) -- converts raw hex value to hex string value
ROWIDTOCHAR(rowid) -- converts rowid to 18 character string format
TO_CHAR(expr [,fmt]) -- converts expr(date or number) to format specified by fmt
TO_DATE(str [,fmt]) -- converts string to date
TO_MULTI_BYTE(str) -- converts single byte string to multi byte string
TO_NUMBER(str [,fmt]) -- converts str to a number formatted by fmt
TO_SINGLE_BYTE(str) -- converts multi byte string to single byte string
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* SQL Date Formats *
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BC, B.C. BC indicator
AD, A.D. AD indicator
CC, SCC Century Code (SCC includes space or - sign)
YYYY, SYYYY 4 digit year (SYYYY includes space or - sign)
IYYY 4 digit ISO year
Y,YYY 4 digit year with comma
YYY, YY, or Y last 3, 2, or 1 digit of year
YEAR, SYEAR year spelled out (SYEAR includes space or - sign)
RR last 2 digits of year in prior or next century
Q quarter or year, 1 to 4
MM month - from 01 to 12
MONTH month spelled out
MON month 3 letter abbreviation
RM roman numeral for month
WW week of year, 1 to 53
IW ISO week of year, 1 to 52 or 1 to 53
W week of month, 1 to 5 (week 1 begins 1st day of the month)
D day of week, 1 to 7
DD day of month, 1 to 31
DDD day of year, 1 to 366
DAY day of week spelled out, nine characters right padded
DY day abbreviation
J # of days since Jan 1, 4712 BC
HH, HH12 hour of day, 1 to 12
HH24 hour of day, 0 to 23
MI minute of hour, 0 to 59
SS second of minute, 0 to 59
SSSSS seconds past midnight, 0 to 86399
AM, A.M. am indicator
PM, P.M. pm indicator
any puctuation punctuation between format items, as in ''''DD/MM/YY''''
any text text between format items
TH converts 1 to ''''1st'''', 2 to ''''2nd'''', and so on
SP converts 1 to ''''one'''', 2 to ''''two'''', and so on
SPTH converts 1 to ''''FIRST'''', 2 to ''''SECOND'''', and so on
FX fill exact : uses exact pattern matching
FM fill mode : toggles suppression of blanks in output
*******************************************************************************来自 http://www.oracle.com.cn/viewthread.php?tid=14850
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