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oracle取值函数

oracle取值函数
 
1.绝对值:abs()
   select abs(-2) value from dual;
2.取整函数(大):ceil()
   select ceil(-2.001) value from dual;(-2)
3.取整函数(小):floor()
   select floor(-2.001) value from dual;(-3)
4.取整函数(截取):trunc()
   select trunc(-2.001) value from dual; (-2)
5.四舍五入:round()
   select round(1.234564) value from dual;(1.2346)
6.取平方:Power(m,n)
   select power(4,2) value from dual;(16)
7.取平方根:SQRT()
   select sqrt(16) value from dual;(4)
8.取随机数:dbms_random(minvalue,maxvalue)
   select sys.dbms.random.value(0,1) value from dual;
9.取符号:Sign()
   select sign(-3) value from dual;(-)
10,取集合的最大值:greatest(value)
   select greatest(-1,3,5,7,9) value from dual;(9)
11.取集合的最小值:least(value)
   select least(-1,3,5,7,9) value from dual;(-1)
12.处理Null值:nvl(空值,代替值)
   select  nvl(null,10) value from dual;(10)
13.求字符序号:ascii()
    select ascii(a) value from dual;
14.求序号字符:chr()
    select chr(97) value from dual;
15.链接:concat()
    select concat("11","22") value from dual;(1122)
16.获取系统时间:sysdate()
    select sysdate value from dual;
17.求日期
    select trunc(sysdate) from dual;
18.求时间
    select  to_char(sysdate,"hh24:mm:ss") from dual;
19.首字母大写:InitCAP()
    select INITCAP(abc def ghi) value from dual;(Abc Def Ghi)

 


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