Oracle常用函數(shù)與SQL Server的實(shí)際比較
以下的文章主要是對(duì)SQL Server與Oracle常用函數(shù)的比較，本文主要包括對(duì)數(shù)學(xué)函數(shù)與三角函數(shù)相關(guān)的常用函數(shù)的具體內(nèi)容的介紹，以下就是具體方案的描述，希望在你今后的學(xué)習(xí)中會(huì)有所幫助。
數(shù)學(xué)函數(shù)
1.絕對(duì)值
- S:select abs(-1) value
- O:select abs(-1) value from dual
2.取整(大)
- S:select ceiling(-1.001) value
- O:select ceil(-1.001) value from dual
3.取整（?。?/p>
S:select floor(-1.001) value
O:select floor(-1.001) value from dual
4.取整（截取）
S:select cast(-1.002 as int) value
O:select trunc(-1.002) value from dual
5.四舍五入
S:select round(1.23456,4) value 1.23460
O:select round(1.23456,4) value from dual 1.2346
6.e為底的冪
S:select Exp(1) value 2.7182818284590451
O:select Exp(1) value from dual 2.71828182
7.取e為底的對(duì)數(shù)
S:select log(2.7182818284590451) value 1
O:select ln(2.7182818284590451) value from dual; 1
8.取10為底對(duì)數(shù)
S:select log10(10) value 1
O:select log(10,10) value from dual; 1
9.取平方
S:select SQUARE(4) value 16
O:select power(4,2) value from dual 16
10.取平方根
S:select SQRT(4) value 2
O:select SQRT(4) value from dual 2
11.求任意數(shù)為底的冪
S:select power(3,4) value 81
O:select power(3,4) value from dual 81
12.取隨機(jī)數(shù)
S:select rand() value
O:select sys.dbms_random.value(0,1) value from dual;
13.取符號(hào)
S:select sign(-8) value -1
O:select sign(-8) value from dual -1
三角函數(shù)相關(guān)
14.圓周率
S:SELECT PI() value 3.1415926535897931
O:SELECT ACOS(-1)from dual 3.1415926535897932384626433832795028842
15.sin,cos,tan 參數(shù)都以弧度為單位
S:SELECT sin() value
O:SELECT sin() value from dual
16.Asin,Acos,Atan,Atan2 參數(shù)都以弧度為單位
S:SELECT Asin() value
O:SELECT Asin() value from dual
17.弧度角度互換
S:DEGREES：弧度-〉角度 RADIANS：角度-〉弧度
O:沒(méi)有提供內(nèi)建的弧度和角度的轉(zhuǎn)換函數(shù)。
數(shù)值間比較
18. 求集合***值
- S:select max(value) value from
- (select 1 value
- union
- select -2 value
- union
- select 4 value
- union
- select 3 value)a
- O:select greatest(1,-2,4,3) value from dual
上述的相關(guān)內(nèi)容就是對(duì)SQL Server與Oracle常用函數(shù)的比較的描述，希望會(huì)給你帶來(lái)一些幫助在此方面。
【編輯推薦】
