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Levenshtein Edit Distance Algorithm

See here for information about the algorithm. This page has a link ( to a T-SQL implementation by Joseph Gama: unfortunately, that function doesn't work. There is a debugged version in the also-referenced package of TSQL functions (, but this still has the fundamental problem that it only works on pairs of strings up to 49 characters.

CREATE FUNCTION edit_distance(@s1 nvarchar(3999), @s2 nvarchar(3999))
DECLARE @s1_len int, @s2_len int, @i int, @j int, @s1_char nchar, @c int, @c_temp int,
@cv0 varbinary(8000), @cv1 varbinary(8000)
SELECT @s1_len = LEN(@s1), @s2_len = LEN(@s2), @cv1 = 0x0000, @j = 1, @i = 1, @c = 0
WHILE @j <= @s2_len
SELECT @cv1 = @cv1 + CAST(@j AS binary(2)), @j = @j + 1
WHILE @i <= @s1_len
SELECT @s1_char = SUBSTRING(@s1, @i, 1), @c = @i, @cv0 = CAST(@i AS binary(2)), @j = 1
WHILE @j <= @s2_len
SET @c = @c + 1
SET @c_temp = CAST(SUBSTRING(@cv1, @j+@j-1, 2) AS int) +
CASE WHEN @s1_char = SUBSTRING(@s2, @j, 1) THEN 0 ELSE 1 END
IF @c > @c_temp SET @c = @c_temp
SET @c_temp = CAST(SUBSTRING(@cv1, @j+@j+1, 2) AS int)+1
IF @c > @c_temp SET @c = @c_temp
SELECT @cv0 = @cv0 + CAST(@c AS binary(2)), @j = @j + 1
SELECT @cv1 = @cv0, @i = @i + 1

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please, it is possible to know the edit distance used in the fuzzy lookup/grouping.
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I hope I was enough clear with my poor english.
Thanks All

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Code Snippetcreate function dbo.Distance( @lat1 float , @long1 float , @lat2 float , @long2 float)
returns float



declare @DegToRad as float
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create function dbo.F_GREAT_CIRCLE_DISTANCE
@Latitude1 float,
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@Latitude2 float,
@Longitude2 float
returns float

Computes the Great Circle distance in kilometers
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Edit: corrected spelling


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SILENT if "-sci-", "-sce-", or "-scy-"
K otherwise, including in "-sch-"

D ----> J if in "-dge-", "-dgy-", or "-dgi-"
T otherwise

F ----> F

G ----> SILENT if in "-gh-" and not at end or before a vowel
in "-gn" or "-gned"
in "-dge-" etc., as in above rule
J if before "i", or "e", or "y" if not double "gg"
K otherwise

H ----> SILENT if after vowel and no vowel follows
or after "-ch-", "-sh-", "-ph-", "-th-", "-gh-"
H otherwise

J ----> J

K ----> SILENT if after "c"
K otherwise

L ----> L

M ----> M

N ----> N

P ----> F if before "h"
P otherwise

Q ----> K

R ----> R

S ----> X (sh) if before "h" or in "-sio-" or "-sia-"
S otherwise

T ----> X (sh) if "-tia-" or "-tio-"
0 (th) if before "h"
silent if in "-tch-"
T otherwise

V ----> F

W ----> SILENT if not followed by a vowel
W if followed by a vowel

X ----> KS

Y ----> SILENT if not followed by a vowel
Y if followed by a vowel

Z ----> S

Declare@Result varchar(25),
@str2 char(2),
@str1 char(1),
@strp char(1),
@strLen tinyint,
@cnt tinyint

set @strLen = len(@str)

--Process beginning exceptions
set @str2 = left(@str,2)
if @str2 in ('ae', 'gn', 'kn', 'pn', 'wr')
set @str = right(@str , @strLen - 1)
set @strLen = @strLen - 1
if@str2 = 'wh'
set @str = 'w' + right(@str , @strLen - 2)
set @strLen = @strLen - 1
set @str1 = left(@str,1)
if @str1= 'x'
set @str = 's' + right(@str , @strLen - 1)
if @str1in ('a','e','i','o','u')
set @str = right(@str , @strLen - 1)
set @strLen = @strLen - 1

while @cnt <= @strLen
set @str1 = substring(@str,@cnt,1)
if @cnt <> 1
elseset@strp=' '

if @strp<> @str1
set @str2 = substring(@str,@cnt,2)

if @str1in('f','j','l','m','n','r')
set@Result=@Result + @str1

if @str1='q'set @Result=@Result + 'k'
if @str1='v'set @Result=@Result + 'f'
if @str1='x'set @Result=@Result + 'ks'
if @str1='z'set @Result=@Result + 's'

if @str1='b'
if @cnt = @strLen
if substring(@str,(@cnt - 1),1) <> 'm'
set@Result=@Result + 'b'
set@Result=@Result + 'b'

if @str1='c'

if @str2 = 'ch' or substring(@str,@cnt,3) = 'cia'
set@Result=@Result + 'x'
if @str2in('ci','ce','cy')and@strp<>'s'
set@Result=@Result + 's'
elseset@Result=@Result + 'k'

if @str1='d'
if substring(@str,@cnt,3) in ('dge','dgy','dgi')
set@Result=@Result + 'j'
elseset@Result=@Result + 't'

if @str1='g'
if substring(@str,(@cnt - 1),3) not in ('dge','dgy','dgi','dha','dhe','dhi','dho','dhu')
if @str2 in ('gi', 'ge','gy')
set@Result=@Result + 'j'
if(@str2<>'gn') or ((@str2<> 'gh') and ((@cnt + 1) <> @strLen))
set@Result=@Result + 'k'

if @str1='h'
if (@strp not in ('a','e','i','o','u')) and (@str2 not in ('ha','he','hi','ho','hu'))
if@strp not in ('c','s','p','t','g')
set@Result=@Result + 'h'

if @str1='k'
if @strp <> 'c'
set@Result=@Result + 'k'

if @str1='p'
if @str2 = 'ph'
set@Result=@Result + 'f'
set@Result=@Result + 'p'

if @str1='s'
if substring(@str,@cnt,3) in ('sia','sio') or @str2 = 'sh'
set@Result=@Result + 'x'
elseset@Result=@Result + 's'

if @str1='t'
if substring(@str,@cnt,3) in ('tia','tio')
set@Result=@Result + 'x'
set@Result=@Result + '0'
if substring(@str,@cnt,3) <> 'tch'
set@Result=@Result + 't'

if @str1='w'
if @str2 not in('wa','we','wi','wo','wu')
set@Result=@Result + 'w'

if @str1='y'
if @str2 not in('ya','ye','yi','yo','yu')
set@Result=@Result + 'y'
set @cnt=@cnt + 1
RETURN @Result

K e i t h H e n r y

Edited by - khenry on 03/06/2002 06:41:15

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Peter Larsson
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