oraclecoshexpfloorinlog等函數(shù)

21.返回一個(gè)數(shù)字反余弦值

SQL> select cosh(20) from dual;

COSH(20)

---------

242582598

22.EXP

返回一個(gè)數(shù)字e的n次方根

SQL> select exp(2),exp(1) from dual;

EXP(2) EXP(1)

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

7.3890561 2.7182818

23.FLOOR

對(duì)給定的數(shù)字取整數(shù)

SQL> select floor(2345.67) from dual;

FLOOR(2345.67)

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

2345

24.LN

返回一個(gè)數(shù)字的對(duì)數(shù)值

SQL> select ln(1),ln(2),ln(2.7182818) from dual;

LN(1) LN(2) LN(2.7182818)

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

0 .69314718 .99999999

25.LOG(n1,n2)

返回一個(gè)以n1為底n2的對(duì)數(shù)

SQL> select log(2,1),log(2,4) from dual;

LOG(2,1) LOG(2,4)

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

0 2

26.MOD(n1,n2)

返回一個(gè)n1除以n2的余數(shù)

SQL> select mod(10,3),mod(3,3),mod(2,3) from dual;

MOD(10,3) MOD(3,3) MOD(2,3)

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

1 0 2

27.POWER

返回n1的n2次方根

SQL> select power(2,10),power(3,3) from dual;

POWER(2,10) POWER(3,3)

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

1024 27

28.ROUND和TRUNC

按照指定的精度進(jìn)行舍入

SQL> select round(55.5),round(-55.4),trunc(55.5),trunc(-55.5) from dual;

ROUND(55.5) ROUND(-55.4) TRUNC(55.5) TRUNC(-55.5)

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

56 -55 55 -55

29.SIGN取數(shù)字n的符號(hào),大于0返回1,小于0返回-1,等于0返回0 SQL> select sign(123),sign(-100),sign(0) from dual;

SIGN(123) SIGN(-100) SIGN(0)

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

1 -1 0

30.SIN

返回一個(gè)數(shù)字的正弦值

SQL> select sin(1.57079) from dual;

SIN(1.57079)

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

1

　　 31.SIGH

返回雙曲正弦的值

SQL> select sin(20),sinh(20) from dual;

SIN(20) SINH(20)

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

.91294525 242582598

32.SQRT

返回?cái)?shù)字n的根

SQL> select sqrt(64),sqrt(10) from dual;

SQRT(64) SQRT(10)

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

8 3.1622777

33.TAN

返回?cái)?shù)字的正切值

SQL> select tan(20),tan(10) from dual;

TAN(20) TAN(10)

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

2.2371609 .64836083

34.TANH

返回?cái)?shù)字n的雙曲正切值

SQL> select tanh(20),tan(20) from dual;

TANH(20) TAN(20)

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

1 2.2371609

35.TRUNC

按照指定的精度截取一個(gè)數(shù)

SQL> select trunc(124.1666,-2) trunc1,trunc(124.16666,2) from dual;

TRUNC1 TRUNC(124.16666,2)

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

100 124.16

36.ADD_MONTHS

增加或減去月份

SQL> select to_char(add_months(to_date(199912,yyyymm),2),yyyymm) from dual;

TO_CHA

------

200002

SQL> select to_char(add_months(to_date(199912,yyyymm),-2),yyyymm) from dual;

TO_CHA

------

199910

37.LAST_DAY

返回日期的最后一天

SQL> select to_char(sysdate,yyyy.mm.dd),to_char((sysdate)+1,yyyy.mm.dd) from dual;

TO_CHAR(SY TO_CHAR((S

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

2004.05.09 2004.05.10

SQL> select last_day(sysdate) from dual;

LAST_DAY(S

----------

31-5月-04

38.MONTHS_BETWEEN(date2,date1)

給出date2-date1的月份

SQL> select months_between(19-12月-1999,19-3月-1999) mon_between from dual;

MON_BETWEEN

-----------

9

SQL>selectmonths_between(to_date(2000.05.20,yyyy.mm.dd),to_date(2005.05.20,yyyy.mm.dd))

mon_betw from dual;

MON_BETW

---------

-60

39.NEW_TIME(date,this,that)

給出在this時(shí)區(qū)=other時(shí)區(qū)的日期和時(shí)間

SQL> select to_char(sysdate,yyyy.mm.dd hh24:mi:ss) bj_time,to_char(new_time 2 (sysdate,PDT,GMT),yyyy.mm.dd hh24:mi:ss) los_angles from dual;

BJ_TIME LOS_ANGLES

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

2004.05.09 11:05:32 2004.05.09 18:05:32

40.NEXT_DAY(date,day)

給出日期date和星期x之后計(jì)算下一個(gè)星期的日期

SQL> select next_day('18-5月-2001','星期五') next_day from dual;

NEXT_DAY

----------

25-5月-01

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