shr逻辑右移的实现

[STEVEN5103]

vb里可以这样实现逻辑右移函数,Oracle里怎么写出shr这个函数?
各位大虾帮忙一起实验下.

'2.逻辑右移

Public Function SHR(OPR As Byte, n As Integer) As Byte
Dim BD As Byte
Dim I As Integer
BD = OPR
For i = 1 To n - 1
BD = BD \ 2 '右移
Next i
CF = BD And 1 '判断D0位是否进位
SHR = BD \ 2
End Function

这里先贴个Oracle里的xor函数:
function bitxor(p_dec1 number, p_dec2 number) return varchar2 is
begin
return
ascii_raw(
utl_raw.cast_to_varchar2(
utl_raw.bit_xor(
raw_ascii(p_dec1),
raw_ascii(p_dec2)
)
)
);
end;

谢了!