log(2,1)log(2,4)

------------------

.52359878

14.trim(‘s‘from‘string‘)

---------------------------

exp(2)exp(1)

sql>selectpower(2,10),power(3,3)fromdual;

sql>selectmod(10,3),mod(3,3),mod(2,3)fromdual;

返回一个数字e的n次方

02

sin(20)sinh(20)

asin(0.5)

xm

返回一个以n1为底n2的对数

sql>selectasin(0.5)fromdual;

----------------------------

weather‘);

返回大于或等于给数字的最小整数

ceil(3.1415927)

wether

22.exp

102

atan(1)

sql>selectcosh(20)fromdual;

27.power

7.38905612.7182818

16.acos

如果不指定,默认为空格符

0.69314718.99999999

31.sigh

sql>selectatan(1)fromdual;

返回一个数字的对数值

24.ln

2345

102427

---------

sign(123)sign(-100)sign(0)

---------

返回双曲正弦的值

---------

3.1415927

--------

.78539816

floor(2345.67)

------------------

---------------

19.ceil

返回一个给定数字的余弦

返回一个n1除以n2的余数

sql>selectceil(3.1415927)fromdual;

sql>selectacos(-1)fromdual;

-------------------------------

----------------------------------------------

15.abs

sin(1.57079)

18.atan

leading剪掉前面的字符

29.sign

trailing剪掉后面的字符

17.asin

1

给反正弦的值

21.cosh

返回一个数字的反正切值

sql>selectsign(123),sign(-100),sign(0)fromdual;

sql>selectlog(2,1),log(2,4)fromdual;

acos(-1)

------------------

4

abs(100)abs(-100)

ln(1)ln(2)ln(2.7182818)

round(55.5)round(-55.4)trunc(55.5)trunc(-55.5)

23.floor

sql>selectabs(100),abs(-100)fromdual;

30.sin

--------------

weather

power(2,10)power(3,3)

返回一个数字的正弦值

25.log(n1,n2)

sql>selectexp(2),exp(1)fromdual;

100100

26.mod(n1,n2)

56-5555-55

sql>selectfloor(2345.67)fromdual;

sql>selectsin(20),sinh(20)fromdual;

mod(10,3)mod(3,3)mod(2,3)

sql>selectln(1),ln(2),ln(2.7182818)fromdual;

返回一个数字反余弦值

---------------

---------

---------------------

照指定的度行舍

本章尚未读完,请击下一页继续阅读---->>>

sql>selectsin(1.57079)fromdual;

28.round和trunc

给反余弦的值

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

返回指定值的绝对值

sql>selectcos(-3.1415927)fromdual;

1-10

sql>selectround(55.5),round(-55.4),trunc(55.5),trunc(-55.5)fromdual;

20.cos

cosh(20)

-1

--

------------

返回n1的n2次方

对给定的数字取整数

cos(-3.1415927)

242582598