SQL内置函数的使用方法及结果(5)

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