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Convert string Hex to Numeric with inline TSQL

By Federico Iori,

Update 2012-12-17

Fast conversion INT to HEX , without UDF or cross apply :

select right(convert( varchar(20), convert( varbinary(3), 16777215 ),1 ),6) 

Update 2012-08-23 : this function is not necessary , it is much better to use :

declare @hex varchar(10) = 'F'
select CAST(CONVERT(VARBINARY, right('0000000000'+@hex,10) , 2) AS bigINT)

It does not require any UDF or cross-apply

=== Follows out to date ====

Let's have a large table Extract_MASTERQUEST_TDR   containing field Transaction_Time_Hex varchar(10), representing hexadecimal Unix timestamp value. 

We need to convert the hex value into numeric .

We could use a TSQL function, as described in http://www.sqlservercentral.com/scripts/Miscellaneous/30770/ but it will not perform fast on large tables. 

This script uses a Table Valued Inline User Defined Function ( UDF), and it is much faster than a standard UDF. It simply calculates the value , using the definition of base 16 numbers.

It is simple concept : in base 10, for example, 234 = 4*(10^0)+3*(10^1)+2*(10^2)

Typical usage :

select * from  Extract_MASTERQUEST_TDR   a

 cross apply  dbo.HEX2BIGINT( right( '00000000'+Transaction_Time_Hex,10)) b  

In this way, by the way, the large table Extract_MASTERQUEST_TDR    will  be scanned by nested loop . If we want to add some join , we could put the code that is into the UDF HEX2BIGINT  straight into the select, letting the optimizer to use hash join 

select Transaction_Time_Hex , 

cast(POWER(16,0) as bigint)*cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex),1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex),1) as bigint)

                     ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex),1)))-55 as bigint)

                END  as bigint) +

cast(POWER(16,1) as bigint)*cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-1,1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-1,1) as bigint)

                     ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-1,1)))-55 as bigint)

                END  as bigint) +                

cast(POWER(16,2) as bigint)*cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-2,1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-2,1) as bigint)

                     ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-2,1)))-55 as bigint)

                END  as bigint) +                

cast(POWER(16,3) as bigint)*cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-3,1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-3,1) as bigint)

                    ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-3,1)))-55 as bigint)

                END  as bigint) + 

cast(POWER(16,4) as bigint)*cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-4,1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-4,1) as bigint)

                     ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-4,1)))-55 as bigint)

                END  as bigint) +                

cast(POWER(16,5) as bigint)*cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-5,1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-5,1) as bigint)

                     ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-5,1)))-55 as bigint)

                END  as bigint) +                

cast(POWER(16,6) as bigint)*cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-6,1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-6,1) as bigint)

                     ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-6,1)))-55 as bigint)

                END  as bigint) +                

cast(POWER(16,7) as bigint)*cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-7,1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-7,1) as bigint)

                     ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-7,1)))-55 as bigint)

                END  as bigint)   +   

                              

POWER(cast(16 as bigint),8) *cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-8,1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-8,1) as bigint)

                     ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-8,1)))-55 as bigint)

                END  as bigint)   +

                              

POWER(cast(16 as bigint),9) *cast(CASE WHEN substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-9,1) LIKE '[0-9]'

                    THEN cast( substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-9,1) as bigint)

                     ELSE CAST(ASCII(UPPER(substring(Transaction_Time_Hex,LEN(Transaction_Time_Hex)-9,1)))-55 as bigint)

                END  as bigint)  as Transaction_Time_Bigint  from Extract_MASTERQUEST_TDR   a   left join .... sth else 

Total article views: 1233 | Views in the last 30 days: 4
 
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