SQL Server和Oracle常用函数区别_[SQL Server教程] S与O分别为SQL Server与Oracle的缩写。 一、数学函数
1.绝对值
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(小)
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为底的幂
S:select Exp(1) value 2.7182818284590451 O:select Exp(1) value from dual 2.71828182
7.取e为底的对数
S:select log(2.7182818284590451) value 1 O:select ln(2.7182818284590451) value from dual; 1
8.取10为底对数
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
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