标签:style color os ar sp div on art log
返回X的绝对值
SQL>SELECT ABS(-1) A,ABS(1) B,ABS(0) C FROM DUAL;
A B C
-------------------- ----------
1 1 0
返回X的反余弦值
SQL>SELECT ACOS(0) A,ACOS(0.5) B,ACOS(1) C FROM DUAL;
A B C
-------------------- ----------
1.570796321.04719755 0
返回X的反正弦值
SQL>SELECT ASIN(0) A,ASIN(0.5) B,ASIN(1) C FROM DUAL;
A B C
-------------------- ----------
0 0.52359877 1.57079632
返回X的反正切值
SQL>SELECT ATAN(0) A,ATAN(0.5) B,ATAN(1) C FROM DUAL;
A B C
-------------------- ----------
0 0.46364760 0.78539816
返回数字X除以Y的反正切值,Y不能为0
SQL>SELECT ATAN2(3,4) A FROM DUAL;
A
----------
0.64350110
返回大于等于X的最小整数
SQL>SELECT CEIL(0) A,CEIL(-0.5) B,CEIL(0.5) C,CEIL(5) D,CEIL(-5) E FROM DUAL;
A B C D E
-------------------- ---------- ---------- ----------
0 0 1 5 -5
说明:返回X的余弦值
举例:
SQL>SELECT COS(0) A,COS(45) B, COS(90) C FROM DUAL;
A B C
-------------------- ----------
1 0.52532198 -0.4480736
说明:返回X的双余弦值
举例:
SQL>SELECT COSH(0) A,COSH(45) B,COSH(90) C FROM DUAL;
A B C
-------------------- ----------
1 1.74671355 6.10201647
说明:返回e的X次幂
举例:
SQL>SELECT EXP(0) A,EXP(1) B,EXP(10) C FROM DUAL;
A B C
-------------------- ----------
1 2.71828182 22026.4657
说明:返回小于等于X的最大整数
举例:
SQL> SELECT FLOOR(0) A,FLOOR(-1.5)B,FLOOR(-1) C,FLOOR(1.5) D,FLOOR(2) E FROM DUAL;
A B C D E
---------- ---------- -------------------- ----------
0 -2 -1 1 2
说明:返回X的自然对数,X不能为0
举例:
SQL>SELECT LN(1) A,LN(45) B FROM DUAL;
A B
--------------------
0 3.80666248
说明:返回以Y为底X的对数,Y不能为0
举例:
SQL>SELECT LOG(10,5) A,LOG(10,20) B,LOG(10,10) C FROM DUAL;
A B C
-------------------- ----------
0.698970001.30102999 1
说明:返回Y除以X以后的余数,假设X为0,则返回Y
举例:
SQL>SELECT MOD(10,10) A,MOD(10,5) B,MOD(10,0) C,MOD(10,20) D FROM DUAL;
A B C D
-------------------- ---------- ----------
0 0 10 10
说明:返回以Y为底的X次幂。Y和X能够为随意数字,但假设Y为负数,则X必须为正数
举例:
SQL>SELECT POWER(2,3) A,POWER(-2,3) B,POWER(2,-3) C FROM DUAL;
A B C
-------------------- ----------
8 -8 0.125
说明:运行四舍五入运算。假设省略Y,则四舍五入到整数位;假设Y为负数,则到小数点前Y位;假设Y为正数,则到小数点后Y位。
举例:
SQL>SELECT ROUND(123.4567) A,ROUND(123.4567,3) B,ROUND(123.4567,-1) C FROM DUAL;
A B C
-------------------- ----------
123 123.457 120
说明:检測X的正负。假设小于0,则返回-1;假设X等于0,则返回0;假设X大于0,则返回1
举例:
SQL>SELECT SIGN(-100) A,SIGN(0) B,SIGN(100) C FROM DUAL;
A B C
-------------------- ----------
-1 0 1
说明:返回X的正弦值
举例:
SQL>SELECT SIN(0) A,SIN(45) B,SIN(90) C FROM DUAL;
A B C
-------------------- ----------
0 0.85090352 0.89399666
说明:返回X的双正弦值
举例:
SQL>SELECT SINH(0) A,SINH(45) B,SINH(90) C FROM DUAL;
A B C
-------------------- ----------
0 1.74671355 6.10201647
说明:返回X的平方根,X必须大于等于0
举例:
SQL>SELECT SQRT(0) A,SQRT(1) B,SQRT(2) C FROM DUAL;
A B C
-------------------- ----------
0 1 1.41421356
说明:返回X的正切值
举例:
SQL>SELECT TAN(0) A,TAN(45) B,TAN(90) C FROM DUAL;
A B C
-------------------- ----------
0 1.61977519 -1.9952004
说明:返回X的双正切值
举例:
SQL>SELECT TANH(0) A,TANH(45) B,TANH(90) C FROM DUAL;
A B C
-------------------- ----------
0 1 1
说明:运行截取数字。假设省略Y,则将X的小数部分截取;假设Y是负数,则截取到小数点前Y位;假设Y为正数,则截取到小数点后Y位
举例:
SQL>SELECT TRUNC(123.4567) A,TRUNC(123.4567,-2) B,TRUNC(123.4567,2) C FROM DUAL;
A B C
-------------------- ----------
123 100 123.45
标签:style color os ar sp div on art log
原文地址:http://www.cnblogs.com/lcchuguo/p/4045657.html