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

25.log(n1,n2)

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

0.69314718.99999999

-1

56-5555-55

7.38905612.7182818

21.cosh

返回一个以n1为底n2的对数

---------

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15.abs

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

返回一个给定数字的余弦

---------

xm

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

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

.52359878

22.exp

16.acos

---------

对给定的数字取整数

sql>selectacos(-1)fromdual;

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

exp(2)exp(1)

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

18.atan

20.cos

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

2345

19.ceil

trailing剪掉后面的字符

floor(2345.67)

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

1-10

返回一个数字的对数值

23.floor

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

--------

24.ln

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

sin(20)sinh(20)

27.power

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

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

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n1的n2次方

返回一个数字的正弦值

cos(-3.1415927)

照指定的度行舍

返回大于或等于给数字的最小整数

sin(1.57079)

242582598

--

3.1415927

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

abs(100)abs(-100)

返回双曲正弦的值

返回一个数字的反正切值

返回一个n1除以n2的余数

30.sin

sql>selectcos(-3.1415927)fromdual;

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

weather‘);

返回指定值的绝对值

.78539816

sql>selectceil(3.1415927)fromdual;

28.round和trunc

4

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

ceil(3.1415927)

atan(1)

weather

31.sigh

---------

102

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

sql>selectasin(0.5)fromdual;

26.mod(n1,n2)

如果不指定,默认为空格符

sql>selectcosh(20)fromdual;

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

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

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

asin(0.5)

sql>selectatan(1)fromdual;

02

1

17.asin

返回一个数字反余弦值

100100

acos(-1)

给反余弦的值

leading剪掉前面的字符

sql>selectfloor(2345.67)fromdual;

cosh(20)

返回一个数字e的n次方

wether

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

给反正弦的值

29.sign

102427

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

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

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

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

14.trim(‘s‘from‘string‘)

sql>selectsin(1.57079)fromdual;