sql server - How to concatenate bits to varbinary with CTE -


i have table ids , bits in following order:

id  bit 1   0 1   0 1   1 1   0 1   0 1   0 1   1 1   0 1   1 1   0 1   ... ... ... 2   0 2   1 2   0 2   0 2   1 2   0 2   0 2   0 2   1 2   0 2   ... ... ... n   ...

how group id column , concatenate bit column varbinary column using cte?

id  bits 1   0x... 2   0x...

thanks in advance...

declare @bits table ( id int, position int, value int ); insert @bits ( id, position, value ) values   ( 1, 0, 1 ), ( 1, 1, 1 ), ( 1, 2, 0 ), ( 1, 3, 1 ),   ( 1, 4, 1 ), ( 1, 5, 1 ), ( 1, 6, 1 ), ( 1, 7, 0 ),   ( 1, 8, 1 ), ( 1, 9, 0 ), ( 1, 10, 1 ), ( 1, 11, 0 ),   ( 1, 12, 1 ), ( 1, 13, 1 ), ( 1, 14, 0 ), ( 1, 15, 1 ),   ( 1, 16, 1 ), ( 1, 17, 0 ), ( 1, 18, 1 ), ( 1, 19, 1 ),   ( 1, 20, 1 ), ( 1, 21, 1 ), ( 1, 22, 1 ), ( 1, 23, 0 ),   ( 1, 24, 1 ), ( 1, 25, 1 ), ( 1, 26, 1 ), ( 1, 27, 0 ),   ( 1, 28, 1 ), ( 1, 29, 1 ), ( 1, 30, 1 ), ( 1, 31, 1 ),   ( 2, 0, 0 ), ( 2, 1, 1 ), ( 2, 2, 0 ), ( 2, 3, 0 ),   ( 2, 4, 0 ), ( 2, 5, 0 ), ( 2, 6, 1 ), ( 2, 7, 0 );  select * @bits order id, position;  extendedbits (   select id, position, value, position / 4 nibbleid, power( 2, 3 - position % 4 ) * value mask     @bits ),   nibbles (   select id, nibbleid, sum( mask ) nibble     extendedbits     group id, nibbleid ),   hexstrings (   select id, stuff( ( select substring( '0123456789abcdef', nibble + 1, 1 ) nibbles id = n.id order nibbleid xml path( '' ) ), 1, 0, '' ) hexstring     nibbles n     group id )   select id, cast( '' xml).value('xs:hexbinary( substring(sql:column("hexstring"), 0) )', 'varbinary(max)') varbin     hexstrings;

note can view intermediate results replacing final select select * extendedbits or nibbles or hexstrings. handy debugging technique.


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