oracle pl/sql函数大全(转)(二)

oracle pl/sql函数大全(转)(二) 收藏
22.EXP
返回一个数字e的n次方根
SQL> select exp(2),exp(1) from dual;
EXP(2)    EXP(1)

--------- ---------
7.3890561 2.7182818

23.FLOOR
对给定的数字取整数
SQL> select floor(2345.67) from dual;

FLOOR(2345.67)
--------------
  2345

24.LN
返回一个数字的对数值
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)
返回一个以n1为底n2的对数
SQL> select log(2,1),log(2,4) from dual;

LOG(2,1)  LOG(2,4)
--------- ---------
0         2


26.MOD(n1,n2)
返回一个n1除以n2的余数
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
-----------
  9
SQL>selectmonths_between(to_date('2000.05.20','yyyy.mm.dd'),to_date('2005.05.20','yyyy.dd')) mon_betw from dual;

MON_BETW
---------
-60


39.NEW_TIME(date,'this','that')
给出在this时区=other时区的日期和时间
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')
给出日期date和星期x之后计算下一个星期的日期
SQL> select next_day('18-5月-2001','星期五') next_day from dual;

NEXT_DAY
----------
25-5月 -01



41.SYSDATE
用来得到系统的当前日期
SQL> select to_char(sysdate,'dd-mm-yyyy day') from dual;

TO_CHAR(SYSDATE,'
-----------------
09-05-2004 星期日
trunc(date,fmt)按照给出的要求将日期截断,如果fmt='mi'表示保留分,截断秒
SQL> select to_char(trunc(sysdate,'hh'),'yyyy.mm.dd hh24:mi:ss') hh,
  2  to_char(trunc(sysdate,'mi'),'yyyy.mm.dd hh24:mi:ss') hhmm from dual;

HH                  HHMM
------------------- -------------------
2004.05.09 11:00:00 2004.05.09 11:17:00



42.CHARTOROWID
将字符数据类型转换为ROWID类型
SQL> select rowid,rowidtochar(rowid),ename from scott.emp;

ROWID              ROWIDTOCHAR(ROWID) ENAME
------------------ ------------------ ----------
AAAAfKAACAAAAEqAAA AAAAfKAACAAAAEqAAA SMITH
AAAAfKAACAAAAEqAAB AAAAfKAACAAAAEqAAB ALLEN
AAAAfKAACAAAAEqAAC AAAAfKAACAAAAEqAAC WARD
AAAAfKAACAAAAEqAAD AAAAfKAACAAAAEqAAD JONES


43.CONVERT(c,dset,sset)
将源字符串 sset从一个语言字符集转换到另一个目的dset字符集
SQL> select convert('strutz','we8hp','f7dec') "conversion" from dual;

conver
------
strutz



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1 楼 stoneeye 2009-12-08