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Levenshtein Edit Distance Algorithm


See here www.merriampark.com/ld.htm for information about the algorithm. This page has a link (http://www.merriampark.com/ldtsql.htm) 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 (http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=502&lngWId=5), 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))
RETURNS int
AS
BEGIN
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
BEGIN
SELECT @s1_char = SUBSTRING(@s1, @i, 1), @c = @i, @cv0 = CAST(@i AS binary(2)), @j = 1
WHILE @j <= @s2_len
BEGIN
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
END
SELECT @cv1 = @cv0, @i = @i + 1
END
RETURN @c
END


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+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++




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Edit: corrected spelling


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We are running SQL Server 7.0 SP2, and are experiencing the following out-of-
space error message:

"Could not allocate new page for database 'FooBar'.
There are no more pages available in filegroup SECONDARY.
Space can be created by dropping objects, adding additional files,
or allowing file growth."

Needless to say, but the the database is set for 10% unlimited autogrowth and there
IS available space in the partition where the filegroup resides.

Any ideas as to why this is happening? What is SQL Server's algorithm for allocating
space when growing a database? Must it satisfy the request in one 'extent' and the
cause of our problem is that our disk is fragmented?

Thanks in advance.

Bill Zimmer - zim@ibx.com

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Better Phonetic Matching Algorithm Than Soundex
Disgruntled with Soundex I went looking for a better phonetic matching algorithm.

Turns out there is a rather good one called Metaphone, which comes in two variants (Simple and Double)

I could find the source for this in C++, but I wanted to have it as a user function.

So here it is:

CREATE FUNCTION dbo.Metaphone(@str as varchar(70))
RETURNS varchar (25)
/*
Metaphone Algorithm

Created by Lawrence Philips.
Metaphone presented in article in "Computer Language" December 1990 issue.
Translated into t-SQL by Keith Henry (keithh_AT_lbm-solutions.com)

*********** BEGIN METAPHONE RULES ***********
Lawrence Philips' RULES follow:
The 16 consonant sounds:
|--- ZERO represents "th"
|
B X S K J T F H L M N P R 0 W Y
Drop vowels

Exceptions:
Beginning of word: "ae-", "gn", "kn-", "pn-", "wr-" ----> drop first letter
Beginning of word: "x" ----> change to "s"
Beginning of word: "wh-" ----> change to "w"
Beginning of word: vowel ----> Keep it


Transformations:
B ----> B unless at the end of word after "m", as in "dumb", "McComb"

C ----> X (sh) if "-cia-" or "-ch-"
S if "-ci-", "-ce-", or "-cy-"
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
*/


AS
BEGIN
Declare@Result varchar(25),
@str3char(3),
@str2 char(2),
@str1 char(1),
@strp char(1),
@strLen tinyint,
@cnt tinyint

set @strLen = len(@str)
set@cnt=1
set@Result=''

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

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

if @strp<> @str1
begin
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'
else
set@Result=@Result + 'b'

if @str1='c'

if @str2 = 'ch' or substring(@str,@cnt,3) = 'cia'
set@Result=@Result + 'x'
else
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'
else
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'
else
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'
else
if@str2='th'
set@Result=@Result + '0'
else
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'
end
set @cnt=@cnt + 1
end
RETURN @Result
END






K e i t h H e n r y


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

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Dijkstra's Shortest Path Algorithm
Here it is, the long lasted algorithm I promised.., -- delete previous map
exec dbo.uspdijkstrainitializemap

-- create a new map
exec dbo.uspdijkstraaddpath 'a', 'b', 4
exec dbo.uspdijkstraaddpath 'a', 'd', 1
exec dbo.uspdijkstraaddpath 'b', 'a', 74
exec dbo.uspdijkstraaddpath 'b', 'c', 2
exec dbo.uspdijkstraaddpath 'b', 'e', 12
exec dbo.uspdijkstraaddpath 'c', 'b', 12
exec dbo.uspdijkstraaddpath 'c', 'f', 74
exec dbo.uspdijkstraaddpath 'c', 'j', 12
exec dbo.uspdijkstraaddpath 'd', 'e', 32
exec dbo.uspdijkstraaddpath 'd', 'g', 22
exec dbo.uspdijkstraaddpath 'e', 'd', 66
exec dbo.uspdijkstraaddpath 'e', 'f', 76
exec dbo.uspdijkstraaddpath 'e', 'h', 33
exec dbo.uspdijkstraaddpath 'f', 'i', 11
exec dbo.uspdijkstraaddpath 'f', 'j', 21
exec dbo.uspdijkstraaddpath 'g', 'd', 12
exec dbo.uspdijkstraaddpath 'g', 'h', 10
exec dbo.uspdijkstraaddpath 'h', 'g', 2
exec dbo.uspdijkstraaddpath 'h', 'i', 72
exec dbo.uspdijkstraaddpath 'i', 'f', 31
exec dbo.uspdijkstraaddpath 'i', 'j', 7
exec dbo.uspdijkstraaddpath 'i', 'h', 18
exec dbo.uspdijkstraaddpath 'j', 'f', 8

-- resolve route
exec dbo.uspdijkstraresolve 'a', 'i'This is the outputFromToCost
----------
ab 4
bc 6
cj18
jf26
fi37

Peter Larsson
Helsingborg, Sweden

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Data Mining Plug In Algorithm
Hi !!

I read that it is possible to create a custom algorithm and use it as a plug in to sql server 2005. What programming language are available for this purpose ? C++ only ? Can I use .net ?

Thank you!

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