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

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

242582598

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

atan(1)

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

sql>selectasin(0.5)fromdual;

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

20.cos

1

17.asin

14.trim(‘s‘from‘string‘)

返回一个以n1为底n2的对数

.78539816

---------

19.ceil

15.abs

返回n1的n2次方

26.mod(n1,n2)

102

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

--------

asin(0.5)

sql>selectatan(1)fromdual;

ceil(3.1415927)

29.sign

sql>selectacos(-1)fromdual;

leading剪掉前面的字符

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

18.atan

27.power

102427

sin(20)sinh(20)

返回一个n1除以n2的余数

weather

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

56-5555-55

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给反正弦的值

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

cos(-3.1415927)

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

exp(2)exp(1)

---------

返回一个数字e的n次方

照指定的度行舍

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

0.69314718.99999999

对给定的数字取整数

sin(1.57079)

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

23.floor

16.acos

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

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

返回一个数字的对数值

---------

返回指定值的绝对值

cosh(20)

acos(-1)

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

返回一个给定数字的余弦

02

返回一个数字的正弦值

sql>selectcosh(20)fromdual;

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

4

wether

28.round和trunc

floor(2345.67)

如果不指定,默认为空格符

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

weather‘);

给反余弦的值

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

---------

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

31.sigh

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

abs(100)abs(-100)

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

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

xm

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

100100

1-10

--

-1

返回双曲正弦的值

24.ln

sql>selectsin(1.57079)fromdual;

2345

.52359878

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

25.log(n1,n2)

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

返回一个数字反余弦值

sql>selectfloor(2345.67)fromdual;

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

trailing剪掉后面的字符

30.sin

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

返回一个数字的反正切值

sql>selectceil(3.1415927)fromdual;

返回大于或等于给数字的最小整数

7.38905612.7182818

sql>selectcos(-3.1415927)fromdual;

3.1415927

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

22.exp

21.cosh