ORACLE函数大全

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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
按照指定的精度进行舍入
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
取数字n的符号,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
返回一个数字的正弦值
SQL> select sin(1.57079) from dual;

SIN(1.57079)
------------
1

31.SIGH
返回双曲正弦的值
SQL> select sin(20),sinh(20) from dual;

SIN(20) SINH(20)
--------- ---------
.91294525 242582598

32.SQRT
返回数字n的根
SQL> select sqrt(64),sqrt(10) from dual;

SQRT(64) SQRT(10)
--------- ---------
8 3.1622777

33.TAN
返回数字的正切值
SQL> select tan(20),tan(10) from dual;

TAN(20) TAN(10)
--------- ---------
2.2371609 .64836083

34.TANH
返回数字n的双曲正切值
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个数
SQL> select trunc(124.1666,-2) trunc1,trunc(124.16666,2) from dual;

TRUNC1 TRUNC(124.16666,2)
--------- ------------------
100 124.16

36.ADD_MONTHS
增加或减去月份
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)
给出date2-date1的月份
SQL> select months_between('19-12月-1999','19-3月-1999') mon_between from dual;

MON_BETWEEN
----------

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