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

如果不指定,默认为空格符

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

leading剪掉前面的字符

sql>selectatan(1)fromdual;

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

sql>selectasin(0.5)fromdual;

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

102427

21.cosh

-1

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

.78539816

.52359878

29.sign

102

27.power

26.mod(n1,n2)

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

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

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

xm

cos(-3.1415927)

100100

17.asin

返回一个数字反余弦值

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

28.round和trunc

---------

trailing剪掉后面的字符

31.sigh

照指定的度行舍

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

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

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

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

sql>selectacos(-1)fromdual;

sql>selectcos(-3.1415927)fromdual;

返回一个数字e的n次方

20.cos

atan(1)

对给定的数字取整数

25.log(n1,n2)

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

weather

242582598

1-10

15.abs

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

返回双曲正弦的值

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

sql>selectsin(1.57079)fromdual;

19.ceil

weather‘);

acos(-1)

sql>selectcosh(20)fromdual;

返回一个数字的对数值

sql>selectceil(3.1415927)fromdual;

1

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

返回指定值的绝对值

56-5555-55

exp(2)exp(1)

---------

返回一个给定数字的余弦

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

23.floor

4

给反正弦的值

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

--------

0.69314718.99999999

---------

返回一个以n1为底n2的对数

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

14.trim(‘s‘from‘string‘)

cosh(20)

sin(20)sinh(20)

7.38905612.7182818

2345

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

sql>selectfloor(2345.67)fromdual;

floor(2345.67)

---------

16.acos

18.atan

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

ceil(3.1415927)

30.sin

asin(0.5)

返回一个数字的正弦值

返回n1的n2次方

返回一个数字的反正切值

24.ln

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02

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

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

wether

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

给反余弦的值

22.exp

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

abs(100)abs(-100)

3.1415927

返回一个n1除以n2的余数

返回大于或等于给数字的最小整数

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

sin(1.57079)

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