21.返回乙個數字反余弦值
sql> select cosh(20) from dual;
cosh(20)
22.exp
返回乙個數字e的n次方根
sql> select exp(2),exp(1) from dual;
exp(2) exp(1)
7.3890561 2.7182818
23.floor
對給定的數字取整數
sql> select floor(2345.67) from dual;
floor(2345.67)
24.ln
返回乙個數字的對數值
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)
返回乙個以n1為底n2的對數
sql> select log(2,1),log(2,4) from dual;
log(2,1) log(2,4)
0 226.mod(n1,n2)
返回乙個n1除以n2的餘數
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
按照指定的精度進行捨入
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取數字n的符號,大於0返回1,小於0返回-1,等於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
返回乙個數字的正弦值
sql> select sin(1.57079) from dual;
sin(1.57079)
131.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
返回數字n的根
sql> select sqrt(64),sqrt(10) from dual;
sqrt(64) sqrt(10)
8 3.1622777
33.tan
返回數字的正切值
sql> select tan(20),tan(10) from dual;
tan(20) tan(10)
2.2371609 .64836083
34.tanh
返回數字n的雙曲正切值
sql> select tanh(20),tan(20) from dual;
tanh(20) tan(20)
1 2.2371609
35.trunc
按照指定的精度擷取乙個數
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
sql> select to_char(add_months(to_date(199912,yyyymm),-2),yyyymm) from dual;
to_cha
37.last_day
返回日期的最後一天
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
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
-6039.new_time(date,this,that)
給出在this時區=other時區的日期和時間
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之後計算下乙個星期的日期
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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