总结归纳：110个Oracle常用函数的总结(2)

文章作者 100test 发表时间 2007:07:02 12:16:07
来源 100Test.Com百考试题网

11.SUBSTR(string,start,count)
取子字符串,从start开始,取count个
SQL> 0select 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> 0select 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> 0select 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> 0select abs(100),abs(-100) from dual.

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

16.ACOS
给出反余弦的值
SQL> 0select acos(-1) from dual.

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

17.ASIN
给出反正弦的值
SQL> 0select asin(0.5) from dual.

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

18.ATAN
返回一个数字的反正切值
SQL> 0select 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> 0select ceil(3.1415927) from dual.

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

20.COS
返回一个给定数字的余弦
SQL> 0select cos(-3.1415927) from dual.

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

src="/oracle/js/wxgg_oracle.js">