Oracle 最常用功能函数经典汇总

Advertisement

Oracle 最常用功能函数经典汇总

SQL中的单记录函数
1.ASCII
返回与指定的字符对应的十进制数;
SQL> select ascii('A') A,ascii('a') a,ascii('0') zero,ascii(' ') space from dual;

A A ZERO SPACE
--------- --------- --------- ---------
65 97 48 32

2.CHR
给出整数,返回对应的字符;
SQL> select chr(54740) zhao,chr(65) chr65 from dual;

ZH C
-- -
赵 A

3.CONCAT
连接两个字符串;
SQL> select concat('010-','88888888')||'转23' 高乾竞电话 from dual;

高乾竞电话
----------------
010-88888888转23

4.INITCAP
返回字符串并将字符串的第一个字母变为大写;
SQL> select initcap('smith') upp from dual;

UPP
-----
Smith

5.INSTR(C1,C2,I,J)
在一个字符串中搜索指定的字符,返回发现指定的字符的位置;
C1 被搜索的字符串
C2 希望搜索的字符串
I 搜索的开始位置,默认为1
J 出现的位置,默认为1
SQL> select instr('oracle traning','ra',1,2) instring from dual;

INSTRING
---------
9

6.LENGTH
返回字符串的长度;
SQL> select name,length(name),addr,length(addr),sal,length(to_char(sal)) from gao.nchar_tst;

NAME LENGTH(NAME) ADDR LENGTH(ADDR) SAL LENGTH(TO_CHAR(SAL))
------ ------------ ---------------- ------------ --------- --------------------
高乾竞 3 北京市海锭区 6 9999.99 7

7.LOWER
返回字符串,并将所有的字符小写
SQL> select lower('AaBbCcDd')AaBbCcDd from dual;

AABBCCDD
--------
aabbccdd

8.UPPER
返回字符串,并将所有的字符大写
SQL> select upper('AaBbCcDd') upper from dual;

UPPER
--------
AABBCCDD

9.RPAD和LPAD(粘贴字符)
RPAD 在列的右边粘贴字符
LPAD 在列的左边粘贴字符
SQL> select lpad(rpad('gao',10,'*'),17,'*')from dual;

LPAD(RPAD('GAO',1
-----------------
*******gao*******
不够字符则用*来填满

10.LTRIM和RTRIM
LTRIM 删除左边出现的字符串
RTRIM 删除右边出现的字符串
SQL> select ltrim(rtrim(' gao qian jing ',' '),' ') from dual;

LTRIM(RTRIM('
-------------
gao qian jing

11.SUBSTR(string,start,count)
取子字符串,从start开始,取count个
SQL> select substr('13088888888',3,8) from dual;

SUBSTR('
--------
08888888

12.REPLACE('string','s1','s2')
string 希望被替换的字符或变量
s1 被替换的字符串
s2 要替换的字符串
SQL> select replace('he love you','he','i') from dual;

REPLACE('H
----------
i love you

13.SOUNDEX
返回一个与给定的字符串读音相同的字符串
SQL> create table table1(xm varchar(8));
SQL> insert into table1 values('weather');
SQL> insert into table1 values('wether');
SQL> insert into table1 values('gao');

SQL> select xm from table1 where soundex(xm)=soundex('weather');

XM
--------
weather
wether

14.TRIM('s' from 'string')
LEADING 剪掉前面的字符
TRAILING 剪掉后面的字符
如果不指定,默认为空格符

15.ABS
返回指定值的绝对值
SQL> select abs(100),abs(-100) from dual;

ABS(100) ABS(-100)
--------- ---------
100 100

16.ACOS
给出反余弦的值
SQL> select acos(-1) from dual;

ACOS(-1)
---------
3.1415927

17.ASIN
给出反正弦的值
SQL> select asin(0.5) from dual;

ASIN(0.5)
---------
.52359878

18.ATAN
返回一个数字的反正切值
SQL> select atan(1) from dual;

ATAN(1)
---------
.78539816

19.CEIL
返回大于或等于给出数字的最小整数
SQL> select ceil(3.1415927) from dual;

CEIL(3.1415927)
---------------
4

20.COS
返回一个给定数字的余弦
SQL> select cos(-3.1415927) from dual;

COS(-3.1415927)
---------------
-1

21.COSH
返回一个数字反余弦值
SQL> select cosh(20) from dual;

COSH(20)
---------
242582598

22.EXP
返回一个数字e的n次方根
SQL> select exp(2),exp(1) from dual;

EXP(2) EXP(1)
--------- ---------
7.3890561 2.7182818

23.FLOOR
对给定的数字取整数
SQL> select floor(2345.67) from dual;

FLOOR(2345.67)
--------------
2345

24.LN
返回一个数字的对数值
SQL> select ln(1),ln(2),ln(2.7182818) from dual;

LN(1) LN(2) LN(2.7182818)
--------- --------- -------------
0 .69314718 .99999999

25.LOG(n1,n2)
返回一个以n1为底n2的对数
SQL> select log(2,1),log(2,4) from dual;

LOG(2,1) LOG(2,4)
--------- ---------
0 2

26.MOD(n1,n2)
返回一个n1除以n2的余数
SQL> select mod(10,3),mod(3,3),mod(2,3) from dual;

MOD(10,3) MOD(3,3) MOD(2,3)
--------- --------- ---------
1 0 2

27.POWER
返回n1的n2次方根
SQL> select power(2,10),power(3,3) from dual;

POWER(2,10) POWER(3,3)
----------- ----------
1024 27

28.ROUND和TRUNC
按照指定的精度进行舍入
SQL> select round(55.5),round(-55.4),trunc(55.5),trunc(-55.5) from dual;

ROUND(55.5) ROUND(-55.4) TRUNC(55.5) TRUNC(-55.5)
----------- ------------ ----------- ------------
56 -55 55 -55

29.SIGN
取数字n的符号,大于0返回1,小于0返回-1,等于0返回0
SQL> select sign(123),sign(-100),sign(0) from dual;

SIGN(123) SIGN(-100) SIGN(0)
--------- ---------- ---------
1 -1 0

30.SIN
返回一个数字的正弦值
SQL> select sin(1.57079) from dual;

SIN(1.57079)
------------
1

31.SIGH
返回双曲正弦的值
SQL> select sin(20),sinh(20) from dual;

SIN(20) SINH(20)
--------- ---------
.91294525 242582598

32.SQRT
返回数字n的根
SQL> select sqrt(64),sqrt(10) from dual;

SQRT(64) SQRT(10)
--------- ---------
8 3.1622777

33.TAN
返回数字的正切值
SQL> select tan(20),tan(10) from dual;

TAN(20) TAN(10)
--------- ---------
2.2371609 .64836083

34.TANH
返回数字n的双曲正切值
SQL> select tanh(20),tan(20) from dual;

TANH(20) TAN(20)
--------- ---------
1 2.2371609

35.TRUNC
按照指定的精度截取一个数
SQL> select trunc(124.1666,-2) trunc1,trunc(124.16666,2) from dual;

TRUNC1 TRUNC(124.16666,2)
--------- ------------------
100 124.16

36.ADD_MONTHS
增加或减去月份
SQL> select to_char(add_months(to_date('199912','yyyymm'),2),'yyyymm') from dual;

TO_CHA
------
200002
SQL> select to_char(add_months(to_date('199912','yyyymm'),-2),'yyyymm') from dual;

TO_CHA
------
199910

37.LAST_DAY
返回日期的最后一天
SQL> select to_char(sysdate,'yyyy.mm.dd'),to_char((sysdate)+1,'yyyy.mm.dd') from dual;

TO_CHAR(SY TO_CHAR((S
---------- ----------
2004.05.09 2004.05.10
SQL> select last_day(sysdate) from dual;

LAST_DAY(S
----------
31-5月 -04

38.MONTHS_BETWEEN(date2,date1)
给出date2-date1的月份
SQL> select months_between('19-12月-1999','19-3月-1999') mon_between from dual;

MON_BETWEEN
-----------
9
SQL>selectmonths_between(to_date('2000.05.20','yyyy.mm.dd'),to_date('2005.05.20','yyyy.mm.dd')) mon_betw from dual;

MON_BETW
---------
-60

39.NEW_TIME(date,'this','that')
给出在this时区=other时区的日期和时间
SQL> select to_char(sysdate,'yyyy.mm.dd hh24:mi:ss') bj_time,to_char(new_time
2 (sysdate,'PDT','GMT'),'yyyy.mm.dd hh24:mi:ss') los_angles from dual;

BJ_TIME LOS_ANGLES
------------------- -------------------
2004.05.09 11:05:32 2004.05.09 18:05:32

40.NEXT_DAY(date,'day')
给出日期date和星期x之后计算下一个星期的日期
SQL> select next_day('18-5月-2001','星期五') next_day from dual;

NEXT_DAY
----------
25-5月 -01

41.SYSDATE
用来得到系统的当前日期
SQL> select to_char(sysdate,'dd-mm-yyyy day') from dual;

TO_CHAR(SYSDATE,'
-----------------
09-05-2004 星期日
trunc(date,fmt)按照给出的要求将日期截断,如果fmt='mi'表示保留分,截断秒
SQL> select to_char(trunc(sysdate,'hh'),'yyyy.mm.dd hh24:mi:ss') hh,
2 to_char(trunc(sysdate,'mi'),'yyyy.mm.dd hh24:mi:ss') hhmm from dual;

HH HHMM
------------------- -------------------
2004.05.09 11:00:00 2004.05.09 11:17:00

42.CHARTOROWID
将字符数据类型转换为ROWID类型
SQL> select rowid,rowidtochar(rowid),ename from scott.emp;

ROWID ROWIDTOCHAR(ROWID) ENAME
------------------ ------------------ ----------
AAAAfKAACAAAAEqAAA AAAAfKAACAAAAEqAAA SMITH
AAAAfKAACAAAAEqAAB AAAAfKAACAAAAEqAAB ALLEN
AAAAfKAACAAAAEqAAC AAAAfKAACAAAAEqAAC WARD
AAAAfKAACAAAAEqAAD AAAAfKAACAAAAEqAAD JONES

43.CONVERT(c,dset,sset)
将源字符串 sset从一个语言字符集转换到另一个目的dset字符集
SQL> select convert('strutz','we8hp','f7dec') "conversion" from dual;

conver
------
strutz

44.HEXTORAW
将一个十六进制构成的字符串转换为二进制

45.RAWTOHEXT
将一个二进制构成的字符串转换为十六进制

46.ROWIDTOCHAR
将ROWID数据类型转换为字符类型

47.TO_CHAR(date,'format')
SQL> select to_char(sysdate,'yyyy/mm/dd hh24:mi:ss') from dual;

TO_CHAR(SYSDATE,'YY
-------------------
2004/05/09 21:14:41

48.TO_DATE(string,'format')
将字符串转化为ORACLE中的一个日期

49.TO_MULTI_BYTE
将字符串中的单字节字符转化为多字节字符
SQL> select to_multi_byte('高') from dual;

50.TO_NUMBER
将给出的字符转换为数字
SQL> select to_number('1999') year from dual;

YEAR
---------
1999

51.BFILENAME(dir,file)
指定一个外部二进制文件
SQL>insert into file_tb1 values(bfilename('lob_dir1','image1.gif'));

52.CONVERT('x','desc','source')
将x字段或变量的源source转换为desc
SQL> select sid,serial#,username,decode(command,
2 0,'none',
3 2,'insert',
4 3,
5 'select',
6 6,'update',
7 7,'delete',
8 8,'drop',
9 'other') cmd from v$session where type!='background';

SID SERIAL# USERNAME CMD
--------- --------- ------------------------------ ------
1 1 none
2 1 none
3 1 none
4 1 none
5 1 none
6 1 none
7 1275 none
8 1275 none
9 20 GAO select
10 40 GAO none

53.DUMP(s,fmt,start,length)
DUMP函数以fmt指定的内部数字格式返回一个VARCHAR2类型的值
SQL> col global_name for a30
SQL> col dump_string for a50
SQL> set lin 200
SQL> select global_name,dump(global_name,1017,8,5) dump_string from global_name;

GLOBAL_NAME DUMP_STRING
------------------------------ --------------------------------------------------
ORACLE.WORLD Typ=1 Len=12 CharacterSet=ZHS16GBK: W,O,R,L,D

54.EMPTY_BLOB()和EMPTY_CLOB()
这两个函数都是用来对大数据类型字段进行初始化操作的函数

55.GREATEST
返回一组表达式中的最大值,即比较字符的编码大小.
SQL> select greatest('AA','AB','AC') from dual;

GR
--
AC
SQL> select greatest('啊','安','天') from dual;

56.LEAST
返回一组表达式中的最小值
SQL> select least('啊','安','天') from dual;

57.UID
返回标识当前用户的唯一整数
SQL> show user
USER 为"GAO"
SQL> select username,user_id from dba_users where user_id=uid;

USERNAME USER_ID
------------------------------ ---------
GAO 25

58.USER
返回当前用户的名字
SQL> select user from dual;

USER
------------------------------
GAO

59.USEREVN
返回当前用户环境的信息,opt可以是:
ENTRYID,SESSIONID,TERMINAL,ISDBA,LABLE,LANGUAGE,CLIENT_INFO,LANG,VSIZE
ISDBA 查看当前用户是否是DBA如果是则返回true
SQL> select userenv('isdba') from dual;

USEREN
------
FALSE
SQL> select userenv('isdba') from dual;

USEREN
------
TRUE
SESSION
返回会话标志
SQL> select userenv('sessionid') from dual;

USERENV('SESSIONID')
--------------------
152
ENTRYID
返回会话人口标志
SQL> select userenv('entryid') from dual;

USERENV('ENTRYID')
------------------
0
INSTANCE
返回当前INSTANCE的标志
SQL> select userenv('instance') from dual;

USERENV('INSTANCE')
-------------------
1
LANGUAGE
返回当前环境变量
SQL> select userenv('language') from dual;

USERENV('LANGUAGE')
----------------------------------------------------
SIMPLIFIED CHINESE_CHINA.ZHS16GBK
LANG
返回当前环境的语言的缩写
SQL> select userenv('lang') from dual;

USERENV('LANG')
----------------------------------------------------
ZHS
TERMINAL
返回用户的终端或机器的标志
SQL> select userenv('terminal') from dual;

USERENV('TERMINA
----------------
GAO
VSIZE(X)
返回X的大小(字节)数
SQL> select vsize(user),user from dual;

VSIZE(USER) USER
----------- ------------------------------
6 SYSTEM

60.AVG(DISTINCT|ALL)
all表示对所有的值求平均值,distinct只对不同的值求平均值
SQLWKS> create table table3(xm varchar(8),sal number(7,2));
语句已处理。
SQLWKS> insert into table3 values('gao',1111.11);
SQLWKS> insert into table3 values('gao',1111.11);
SQLWKS> insert into table3 values('zhu',5555.55);
SQLWKS> commit;

SQL> select avg(distinct sal) from gao.table3;

AVG(DISTINCTSAL)
----------------
3333.33

SQL> select avg(all sal) from gao.table3;

AVG(ALLSAL)
-----------
2592.59

61.MAX(DISTINCT|ALL)
求最大值,ALL表示对所有的值求最大值,DISTINCT表示对不同的值求最大值,相同的只取一次
SQL> select max(distinct sal) from scott.emp;

MAX(DISTINCTSAL)
----------------
5000

62.MIN(DISTINCT|ALL)
求最小值,ALL表示对所有的值求最小值,DISTINCT表示对不同的值求最小值,相同的只取一次
SQL> select min(all sal) from gao.table3;

MIN(ALLSAL)
-----------
1111.11

63.STDDEV(distinct|all)
求标准差,ALL表示对所有的值求标准差,DISTINCT表示只对不同的值求标准差
SQL> select stddev(sal) from scott.emp;

STDDEV(SAL)
-----------
1182.5032

SQL> select stddev(distinct sal) from scott.emp;

STDDEV(DISTINCTSAL)
-------------------
1229.951

64.VARIANCE(DISTINCT|ALL)
求协方差

SQL> select variance(sal) from scott.emp;

VARIANCE(SAL)
-------------
1398313.9

65.GROUP BY
主要用来对一组数进行统计
SQL> select deptno,count(*),sum(sal) from scott.emp group by deptno;

DEPTNO COUNT(*) SUM(SAL)
--------- --------- ---------
10 3 8750
20 5 10875
30 6 9400

66.HAVING
对分组统计再加限制条件
SQL> select deptno,count(*),sum(sal) from scott.emp group by deptno having count(*)>=5;

DEPTNO COUNT(*) SUM(SAL)
--------- --------- ---------
20 5 10875
30 6 9400
SQL> select deptno,count(*),sum(sal) from scott.emp having count(*)>=5 group by deptno ;

DEPTNO COUNT(*) SUM(SAL)
--------- --------- ---------
20 5 10875
30 6 9400

67.ORDER BY
用于对查询到的结果进行排序输出
SQL> select deptno,ename,sal from scott.emp order by deptno,sal desc;

DEPTNO ENAME SAL
--------- ---------- ---------
10 KING 5000
10 CLARK 2450
10 MILLER 1300
20 SCOTT 3000
20 FORD 3000
20 JONES 2975
20 ADAMS 1100
20 SMITH 800
30 BLAKE 2850
30 ALLEN 1600
30 TURNER 1500
30 WARD 1250
30 MARTIN 1250
30 JAMES 950

=================================================

* SQL Group Functions (num can be a column or expression)           *
  (null values are ignored, default between distinct and all is all)      *
  *******************************************************************************
  AVG([distinct or all] num)   -- average value
  COUNT(distinct or all] num)   -- number of values
  MAX([distinct or all] num)   -- maximum value
  MAX([distinct or all] num)   -- minimum value
  STDDEV([distinct or all] num)  -- standard deviation
  SUM([distinct or all] num)   -- sum of values
  VARIANCE([distinct or all] num) -- variance of values
   
  *******************************************************************************
  * Miscellaneaous Functions :                         *
  *******************************************************************************
  DECODE(expr, srch1, return1 [,srch2, return2...], default]
      -- if no search matches the expression then the default is returned,
      -- otherwise, the first search that matches will cause
      -- the corresponding return value to be returned
  DUMP(column_name [,fmt [,start_pos [, length]]])
     -- returns an internal oracle format, used for getting info about a column
     -- format options : 8 = octal, 10 = decimel, 16 = hex, 17 = characters
     -- return type codes : 1 = varchar2, 2 = number, 8 = long, 12 = date,
     --  23 = raw, 24 = long raw, 69 = rowid, 96 = char, 106 = mlslabel
  GREATEST(expr [,expr2 [, expr3...]]
     -- returns the largest value of all expressions
  LEAST(expr [,expr2 [, expr3...]]
     -- returns the smallest value of all expressions
  NVL(expr1 ,expr2
     -- if expr1 is not null, it is returned, otherwise expr2 is returned
  SQLCODE
     -- returns sql error code of last error. Can not be used directly in query,
     -- value must be set to local variable first
  SQLERRM
     -- returns sql error message of last error. Can not be used directly in query,
     -- value must be set to local variable first
  UID
     -- returns the user id of the user you are logged on as
     -- useful in selecting information from low level sys tables
  USER
     -- returns the user name of the user you are logged on as
  USERENV('option')
     -- returns information about the user you are logged on as
     -- options : ENTRYID, SESSIONID, TERMINAL, LANGUAGE, LABEL, OSDBA
     --      (all options not available in all Oracle versions)
  VSIZE(expr)
     -- returns the number of bytes used by the expression
     -- useful in selecting information about table space requirements
   
  *******************************************************************************
  * SQL Date Functions (dt represents oracle date and time)           *
  * (functions return an oracle date unless otherwise 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) -- returns fractional value of months between dt1, dt2
  NEW_TIME(dt, tz1, tz2)  -- dt = date in time zone 1, returns date in time zone 2
  NEXT_DAY(dt, str)    -- date of first (str) after dt (str = 'Monday', etc..)
  SYSDATE         -- present system date
  ROUND(dt [,fmt]     -- rounds dt as specified by format fmt
  TRUNC(dt [,fmt]     -- truncates dt as specified by format fmt
   
  *******************************************************************************
  * Number Functions :                             *
  *******************************************************************************
  ABS(num)       -- absolute value of num
  CEIL(num)      -- smallest integer > or = num
  COS(num)       -- cosine(num), num in radians
  COSH(num)      -- hyperbolic cosine(num)
  EXP(num)       -- e raised to the num power
  FLOOR(num)      -- largest integer < or = num
  LN(num)       -- natural logarithm of num
  LOG(num2, num1)   -- logarithm base num2 of num1
  MOD(num2, num1)   -- remainder of num2 / num1
  POWER(num2, num1)  -- num2 raised to the num1 power
  ROUND(num1 [,num2]  -- num1 rounded 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 num
  CONCAT(str1, str2)   -- str1 concatenated with str2 (same as str1||str2)
  INITCAP(str)      -- capitalize first letter of each word in str
  LOWER(str)       -- str with all letters in lowercase
  LPAD(str1, num [,str2]) -- left pad str1 to length num with str2 (default spaces)
  LTRIM(str [,set])    -- remove set from left side of str (default spaces)
  NLS_INITCAP(str [,nls_val]) -- same as initcap for different languages
  NLS_LOWER(str [,nls_val])  -- same as lower for different languages
  REPLACE(str1, str2 [,str3]) -- replaces str2 with str3 in str1
                 -- deletes str2 from str1 if str3 is omitted
  RPAD(str1, num [,str2])   -- right pad str1 to length num with str2 (default spaces)
  RTRIM(str [,set])      -- remove set from right side of str (default spaces)
  SOUNDEX(str)        -- phonetic representation of str
  SUBSTR(str, num2 [,num1])  -- substring of str, starting with num2,
                 -- num1 characters (to end of str if num1 is omitted)
  SUBSTRB(str, num2 [,num1]) -- same as substr but num1, num2 expressed in bytes
  TRANSLATE(str, set1, set2) -- replaces set1 in str with set2
                 -- if set2 is longer than set1, it will be truncated
  UPPER(str)         -- str with all letters 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])

Similar Posts:

  • JavaScript常用验证函数实例汇总

    本文实例汇总了JavaScript常用验证函数.分享给大家供大家参考.具体汇总如下: 一.字符串类验证 1. 长度限制 代码如下: <script> function test() { if(document.a.b.value.length>50) { alert("不能超过50个字符!"); document.a.b.focus(); return false; } } </script> <form name=a onsubmit="

  • C++ 常用功能函数整理

    一.字符转换类 1. int to string string int_to_string(int x){ stringstream ss; ss<<x; return ss.str(); } 二.文本处理功能类函数 void split(string& delim,string& s, vector< string >& ret){ size_t last = 0; size_t index=s.find_first_of(delim,last); whi

  • js常用功能函数

    1,获取中文字符串拼音首字母串的函数 <mce:script language=javascript><!-- cntext=window.prompt("请输入中文:"); // --></mce:script> <mce:script language=vbs><!-- function getpychar(char) tmp=65536+asc(char) if(tmp>=45217 and tmp<=45252)

  • 常用功能函数

    using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices; //调用DLL需要引用空间 using System.Management; //获取计算机硬件信息需要引用的空间,需要添加引用 using System.Windows.Forms; using System.IO; //当你引用using Excel = Microsoft.Offic

  • Oracle 11g 常用函数(Functions)详解

    Oracle 11g 常用函数(Functions)详解 目录 ABS. 3 ACOS. 3 ADD_MONTHS. 4 ASCII 4 ASCIISTR. 5 ASIN.. 5 ATAN.. 5 ATAN2. 5 AVG.. 6 BFILENAME. 6 BIN_TO_NUM... 6 BITAND.. 7 CARDINALITY. 7 CAST. 7 CEIL. 8 CHARTOROWID.. 8 CHR. 9 COALESCE. 9 COMPOSE. 9 CONCAT. 9 CONVERT

  • oracle中常用函数大全

    1.数值型常用函数 函数 返回值 样例 显示 ceil(n) 大于或等于数值n的最小整数 select ceil(10.6) from dual; 11 floor(n) 小于等于数值n的最大整数 select ceil(10.6) from dual; 10 mod(m,n) m除以n的余数,若n=0,则返回m select mod(7,5) from dual; 2 power(m,n) m的n次方 select power(3,2) from dual; 9 round(n,m) 将n四舍

  • 前端常用功能记录(二)—datatables表格(转)

    前端常用功能记录(二)-datatables表格 并不是所有的后台开发都有美工和前端工程师来配合做页面,为了显示数据并有一定的美感,jQuery的DataTables插件对于像我这样的前端菜鸟来说真是雪中送炭,当然对于专业的前端开发者来说它更是锦上添花!DataTables提供了针对表格的排序.浏览器分页.服务器分页.筛选.格式化.统计等强大功能. 工作中对程序员的学习模式才深有体会,不是从入门到精通,而是从会用到了解.对于我来说,基本都是拿到一个知识先做个东西出来,再来细细品味个中的细节,然后

  • jQuery中常用的函数方法总结

    jQuery中为我们提供了很多有用的方法和属性,自己总结的一些常用的函数,方法.个人认为在www.21kaiyun.com的紫微斗数星座在线排盘开发中会比较常用的,仅供大家学习和参考. 事件处理 ready(fn) 代码: $(document).ready(function(){ // Your code here... }): 作用:它可以极大地提高web应用程序的响应速度.通过使用这个方法,可以在DOM载入就绪能够读取并操纵时立即调用你所绑定的函数,而99.99%的JavaScript函数

  • 160229-01、web页面常用功能js实现

    web页面常用功能js实现 1.网页未加载时弹出新窗口 <body onunload="window.open('http://www.a68.cn');"></body> 2.浏览网页时鼠标不能点击右键 <body oncontextmenu="window.event.returnValue=false"></body> 3.设置回车键 <form id="myform" action=&

  • 常用的PHP正则表达式汇总

    原文:常用的PHP正则表达式汇总 PHP中的常用正则表达式集锦: 匹配中文字符的正则表达式: [\u4e00-\u9fa5] 评注:匹配中文还真是个头疼的事,有了这个表达式就好办了 匹配双字节字符(包括汉字在内):[^\x00-\xff] 评注:可以用来计算字符串的长度(一个双字节字符长度计2,ASCII字符计1) 匹配空白行的正则表达式:\n\s*\r 评注:可以用来删除空白行 匹配HTML标记的正则表达式:<(\S*?)[^>]*>.*?</\1>|<.*? /&g

Tags: