无符号右移'>>>'sql server中的运算符

Question

如何在sql server中编写无符号右移运算符？表达就像value >>> 0

这是例如-5381 >>> 0 = 4294961915

Answer 1

T-SQL没有位移操作符,所以你必须自己实现一个.这里有一个按位变换的实现:http://dataeducation.com/bitmask-handling-part-4-left-shift-and-right-shift/

你必须将你的整数转换为varbinary,使用按位移位函数并转换回整数和(希望)hey-presto!这是你期待的结果.

实施和测试留给读者练习......

编辑 - 为了澄清我在下面的注释中添加的内容,执行此SQL将演示各种CAST给出的不同结果:

SELECT -5381 AS Signed_Integer,
        cast(-5381 AS varbinary) AS Binary_Representation_of_Signed_Integer,
        cast(cast(-5381 AS bigint) AS varbinary) AS Binary_Representation_of_Signed_Big_Integer, 
        cast(cast(-5381 AS varbinary) AS bigint) AS Signed_Integer_Transposed_onto_Big_Integer, 
        cast(cast(cast(-5381 AS varbinary) AS bigint) AS varbinary) AS Binary_Representation_of_Signed_Integer_Trasposed_onto_Big_Integer

结果:

Signed_Integer Binary_Representation_of_Signed_Integer                        Binary_Representation_of_Signed_Big_Integer                    Signed_Integer_Transposed_onto_Big_Integer Binary_Representation_of_Signed_Integer_Trasposed_onto_Big_Integer
-------------- -------------------------------------------------------------- -------------------------------------------------------------- ------------------------------------------ ------------------------------------------------------------------
-5381          0xFFFFEAFB                                                     0xFFFFFFFFFFFFEAFB                                             4294961915                                 0x00000000FFFFEAFB