如何在sql中提取1个字节 [英] How to extract the 1 out of a byte in sql

问题描述

如果设置了位置x，我需要读取。

所以我想检查一下是否使用了useragent = chrome



我尝试：

I need to read if a bit on position x is set.
So for instance I want to check if useragent = chrome

I try:

select UserAgent from bits where UserAgent &3 =4
I get nothing. How do I get just the chrome from bits table (00000111)?

00000001 = all
00000011 = opera
00000111 = chrome
00001111 = safari

create table bits(UserAgent binary)
insert into bits(userAgent) values (00000001)
insert into bits(userAgent) values (00000011)
insert into bits(userAgent) values (00000111)
insert into bits(userAgent) values (00001111)

谢谢，

Robert

Thanks,
Robert

推荐答案

试试这个。我认为你设置位的方式存在逻辑问题。在我看来，这应该是位值



全部= 111

opera = 001

chrome = 010

safari = 100

Try this. I think there is logic issue with the way you are setting the bits. In my opinion thsi should be bit values

All =111
opera=001
chrome =010
safari=100

select UserAgent&4 from @bits
where UserAgent&4=4

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