## Calculate alphabetic sequence

 Author Message Lobo Mau SSC Rookie Group: General Forum Members Points: 25 Visits: 26 Comments posted to this topic are about the item Calculate alphabetic sequence alfonso.pg Forum Newbie Group: General Forum Members Points: 3 Visits: 98 The article is lacking in details, examples and explanations...Of particular interest would be comparing a CLR function's performance to the stored procedure, below, and to a SQL UDF (:sick...I thought I would add the following info which can be expanded by other SSC members.The following procedure will convert a bigint value to a customizable Bijective (http://en.wikipedia.org/wiki/Bijective_numeration) value:`CREATE PROCEDURE base10ToBijectiveBaseX @input BIGINT ,@digits NVARCHAR( 30 ) = N'ABCDEFGHIJKLMNOPQRSTUVWXYZ' ,@output NVARCHAR( 100 ) = N'' OUTPUTASBEGIN DECLARE @length BIGINT ,@remainder BIGINT ; SELECT @length = LEN( @digits ) ; WHILE @input > 0 BEGIN SELECT @remainder = @input % @length ; IF @remainder = 0 SELECT @remainder = @length ; SELECT @output = SUBSTRING( @digits ,@remainder ,1 ) + @output ,@input = ( @input - @remainder ) / @length ; END -- Include the following lines if you want to output the value as a table value SELECT @output ;END`Execute the proceure using code similar to this:`DECLARE @converted NVARCHAR( 100 ) ,@myValue BIGINT;SELECT @myValue = 220222;EXEC base10ToBijectiveBaseX @input = @myValue ,@output = @converted OUTPUT;SELECT @converted AS convertedValue;`Or...`DECLARE @converted NVARCHAR( 100 ) ,@myValue BIGINT;SELECT @myValue = 220222;EXEC base10ToBijectiveBaseX @input = @myValue ,@digits = N'AaBbCcXxYyZz' ,@output = @converted OUTPUT;SELECT @converted AS convertedValue;`I wil omit adding the reverse (BijectiveToBase10) code in hopes of encouraging someone else to participate... Bill Talada SSCarpal Tunnel Group: General Forum Members Points: 4661 Visits: 2226 Ouch this hurt my brain and took me an hour...but it is slick!This converts from any base to any base, like hex to decimal or octal.`/*William TaladaDefine baseX and baseYPass in a baseX value and it gets converted to baseYCurrently set to convert hex to binary but can handle any imaginary base.*/declare @inA varchar(50), @baseX varchar(30), @baseY varchar(30)set @inA = 'FF';set @baseX = '0123456789ABCDEF'; -- must always start with zero even if never used (column placeholder for numbers like 20, 130, etc).set @baseY = '01'; -- must always start with zero even if never used (column placeholder).declare @i int, @in10 int, @div10 int, @outB varchar(50), @RadixA int, @RadixB int;set @outB = '';set @RadixA = len(@baseX);set @RadixB = len(@baseY);-- first convert @inA to @in10, base10set @inA = reverse(@inA);set @i = 1;set @in10 = 0;while @i <= len(@inA)begin set @in10 = @in10 + ((charindex(substring(@inA, @i, 1), @baseX) - 1) * power(@radixA, @i-1)) set @i = @i + 1;endselect @in10;-- now convert to new baseset @i = 1;while (@in10 / power(@radixB, @i)) > 0 set @i = @i + 1; -- calculate number of columns needed for destination radix.set @i = @i - 1; -- overshot so back up.While @i >= 0begin set @div10 = @in10 / power(@radixB, @i); -- get magnitude of left most digit in destination radix. set @in10 = @in10 - (@div10 * power(@radixB, @i)); -- set remainder set @outB = @outB + substring(@baseY, @div10+1, 1); -- build output string set @i = @i - 1 -- calc next lower magnitudeendselect @outB;` Iwas Bornready One Orange Chip Group: General Forum Members Points: 29556 Visits: 885 Thanks for the script.

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