-- returns inf
ormation about the user you
are logged on as
-- options : E
NTRYID, SESSIONID, TERMINAL,
LANGUAGE, LABEL, OSDBA
-- (
all options not available in
all Oracle versions)
VSIZE(expr)
-- returns the number of b
ytes used by the expression
-- useful in s
electing information about t
able space requirements
********************
***************
****************************
****************
* SQL Date Functions (dt represe
*
nts oracle date and time)
* (functions return
*
an oracle date unless otherw
ise specified)
********************************
***********************
************************
ADD_MONTHS(dt, num)
-- adds num months to
dt (num can be negative)
LAST_DAY(dt)
-- last day of month in
month containing dt
MONTHS_BETWEEN(dt1, dt2) -- retu
dt2
rns fractional value of months between dt1,
NEW_TIME(dt, tz1, tz
zone 2
2) -- dt = date in time zo
ne 1, returns date in time
NEXT_DAY(dt, str) -- date
etc..)
of first (str) after dt (str = ''''Monday'''',
SYSDATE -- present system date
ROUND(dt [,fmt] -- roun
ds dt as specified by format fmt
TRUNC(dt [,fmt]
-- truncates dt as spe
cified by format fmt
********************************
***********************
************************
* Number Functions :
*
********************************
***********************
************************
ABS(num) -- absolute
value of num
CEIL(num) -- smallest integer > or = num
COS(num) -- cosine(n
um), num in radians
COSH(num)
-- hyperbolic cosine(num)
EXP(num)
-- e raised to the num powe
r
FLOOR(num) -- largest
integer < or = num
LN(num) -- natural
logarithm of num
LOG(num2, num1) -- logarith
m base num2 of num1
MOD(num2, num1) -- remainde
r of num2 / num1
POWER(num2, num1)
-- num2 raised to the num1
power
ROUND(num1 [,num2] -- num1 rou
nded to num2 decimel places (default 0)
SIGN(num) -- sign of
num * 1, 0 if num = 0
SIN(num)
-- sin(num), num in radians
SINH(num) -- hyperbolic sine(num)
SQRT(num) -- square root of num
TAN(num) -- tangent(
num), num in radians
TANH(num)
-- hyperbolic tangent(num)
TRUNC(num1 [,num2] -- truncate
num1 to num2 decimel places (default 0)
********************************
***********************
************************
* String Functions,
*
String Result :
********************************
***********************
************************
(num) -- ASCII
character for num
CHR(num)
-- ASCII character for n
um
CONCAT(str1, str2) -- str1
concatenated with str2 (same as str1||str2)
INITCAP(str)
-- capitalize first lett
er of each word in str
LOWER(str) -- str w
ith all letters in lowercase
LPAD(str1, num [,str2]) -- left
spaces)
pad str1 to length num with str2 (default
LTRIM(str [,set])
-- remove set from left
side of str (default spaces)
NLS_INITCAP(str [,nl
s_val]) -- same as initcap f
or different languages
NLS_LOWER(str [,nls_
val]) -- same as lower for
different languages
REPLACE(str1, str2 [,str3]) -- r
eplaces str2 with str3 in str1
--
deletes str2 from str1 if str3 is omitted
RPAD(str1, num [,str
(default spaces)
2]) -- right pad str1 to
length num with str2
RTRIM(str [,set])
spaces)
-- remove set from
right side of str (default
SOUNDEX(str)
-- phonetic represen
tation of str
SUBSTR(str, num2 [,n
um1]) -- substring of str,
starting with num2,
--
omitted)
num1 characters (to end of str if num1 is
SUBSTRB(str, num2 [,
bytes
num1]) -- same as substr bu
t num1, num2 expressed in
TRANSLATE(str, set1,
set2) -- replaces set1 in
str with set2
--
truncated
if set2 is longer than set1, it will be
UPPER(str)
-- str with all lett
ers in uppercase
********************
***************
****************************
****************
* String Functions,
*
Numeric Result :
********************************
***********************
************************
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
********************************
***********************
************************
* SQL Conversion Functions
*
********************************
***********************
************************
CHARTOROWID(str)
-- converts str to ROWID
CONVERT(str, chr_set2 [,chr_set1
]) -- converts str to chr_set2
character set
-- chr_set1
default is the datbase
HEXTORAW(str)
-- converts hex string va
lue to internal raw values
RAWTOHEX(raw_val) -- convert
s raw hex value to hex string value
ROWIDTOCHAR(rowid)
-- converts rowid to 18 ch
aracter string format
TO_CHAR(expr [,fmt])
fmt
-- converts expr(date or n
umber) to format specified by
TO_DATE(str [,fmt])
-- converts str上一页 [1] [2] [3] [4] [5] 下一页 |
