SQL Server Get first byte on an Integer

uhry853o 于 2023-10-15 发布在其他

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How can I get the first byte of an integer value in SQL Server?

In C#, I can do it easily using the BitConverter :

int x = 383;
var firstByte = BitConverter.GetBytes(x)[0];
Console.WriteLine(x);

// Expected Result: 127

How can I get same value in SQL Server query?

Thanks in advance

sql-server

来源：https://stackoverflow.com/questions/77116517/get-first-byte-on-an-integer

3条答案

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gz5pxeao1#

Ok, I got alternate help from ChatGPT.

DECLARE @num INT;
SET @num = 383;
SELECT @num & 0xFF AS FirstByte; -- Expected result is 127

But I dont know the theory behind the query.

赞(0）回复(0）举报 2023-10-15

20jt8wwn2#

If you want the first byte, you can run it through a data type cast. Like so:

declare @i int = 383;
select cast(@i as binary(1));

If you need to have that as 127 (which in SQL is some sort of numeric data type), cast the result of the binary cast to tinyint (or whatever you want).

赞(0）回复(0）举报 2023-10-15

cbjzeqam3#

declare @i int = 383;
select cast(cast(@i as binary(1)) as int);

赞(0）回复(0）举报 2023-10-15

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SQL Server Get first byte on an Integer

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