Hi,
please, it is possible to know the edit distance used in the fuzzy lookup/grouping.
On this forum I read fuzzy lookup use 4-gram with fix size.
Does exist any document explaining how fuzzy lookup calculate the similarity? In other word, what kind of edit distance, algorithm is used by fuzzy lookup/grouping?
I hope I was enough clear with my poor english.
Thanks All
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
Hi
How do I get a nearest distance of a point? For example, I have two tables A and B and I want to find the nearest distance between the records of the two tables. In addition, one of the tables should also give me the distance. The data I have geo spatial data. Can this be done in SQL
Help will be appreciated
Is there a recommended practice for mirroring in regards to distance? Is it best practice to mirror with both nodes at the same physical location and use another method for failing over to a remote location or can one just put the other node in the mirror a few thousand miles away? I'm suspecting not.
Any comments??
I'm trying to run a dyncamic query that returns all records within a specific distance of a certain point. The longitude and latitude of each record is stored in the database. The query is constructed from two dynamic variables $StartLatitude and $StartLongitude with represent the starting point.
SELECT UserID, ACOS(SIN($StartLatitude * PI() / 180) * SIN(Latitude * PI() / 180) + COS($StartLatitude * PI() / 180) * COS(Latitude * PI() / 180) * COS(($StartLongitude - Longitude) * PI() / 180)) * 180 / PI() * 60 * 1.1515 AS Distance
FROM HPN_Painters
HAVING (Distance <= 150)
It runs fine until I add the 'HAVING (Distance <= 150)' clause, in which I recieve the error: Invalid column name 'Distance' It seems that Distance cannot be referenced in the HAVING clause.
I'm looking to find out how I'd go about setting up a database where avisitor to my site could punch in their postal code, and find out how farthey are from another postal code. For example, AutoTrader has this featureI believe to tell you how far the vehicle is from you. Dating sites havethem so you can do proximity searches.Anyone have any ideas where I could start? I'm thinking the post office,but if anyone else has suggestions, I'm open to hear them.Thanks!
View 4 Replies View RelatedVarious posts have noted that mirroring over distance is not advisable or that either async connections should be used.
Are there any limits/recommendations i.e. if two datacenters are a couple of files part with 10GBs fibre links and <50ms response times would this be acceptable for high-availability mirroring?
I am new to data mining so please excuse my ignorance. Lets assume
- i have created a cluser model
- identified 3 clusters ( a, b, c)
- each record consists of 15 columns
- collecting new records( 15 variables) real time
what i would like to do is plot these new records programmatically as i collect them realtime. I assume this new record will belong to one of these three clusters. I believe we can find the cluster this new record belongs to by ' SELECT Cluster()....' and distance from the center of the cluster by ClusterDistance(). To plot this on a 2-dimentional space i need (x, y).
ClusterDistance() could be Y but what will be X.
thanks.
I have a user defined function, I want to determine the distance between the 2 points. I have it working but i'm having a problem getting to print.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Code Snippetcreate function dbo.Distance( @lat1 float , @long1 float , @lat2 float , @long2 float)
returns float
as
begin
declare @DegToRad as float
declare @Ans as float
declare @Miles as float
set @DegToRad = 57.29577951
set @Ans = 0
set @Miles = 0
if @lat1 is null or @lat1 = 0 or @long1 is null or @long1 = 0 or @lat2 is
null or @lat2 = 0 or @long2 is null or @long2 = 0
begin
return ( @Miles )
end
set @Ans = SIN(@lat1 / @DegToRad) * SIN(@lat2 / @DegToRad) + COS(@lat1 / @DegToRad ) * COS( @lat2 / @DegToRad ) * COS(ABS(@long2 - @long1 )/@DegToRad)
set @Miles = 3959 * ATAN(SQRT(1 - SQUARE(@Ans)) / @Ans)
set @Miles = CEILING(@Miles)
return ( @Miles )
end
DECLARE @RC float
EXEC Distance '39.943762', '-78.122265', '32.334709', '-96.633546'
PRINT @RC /* in miles */
Great Circle distance calculation
Is there any stored procedure or application that implements Great Circle distance calculation
DECLARE @Latitude NUMERIC(9, 6), @Longitude NUMERIC(9, 6)
DECLARE @MyLatitude NUMERIC(9, 6), @MyLongitude NUMERIC(9, 6)
Set @Latitude = 42.329596;
Set @Longitude = -83.709286;
Set @MyLatitude = 42.430883;
Set @MyLongitude = -82.923642;
Question: How do we calculate the distance in miles between the 2 points.
I am trying to write a piece of SQL which gives me a list of enquiries within 10 metre distance of a enquiry.
The idea is to identify possible duplicates.
Table: enquiry
Primary key: enquiry_number
Co-ordinates data fields: enquiry.enquiry_easting and enquiry.enquiry_northing.
I will need to self-search on the same table to find possible enquiries within 10m distance.
I am trying to use the haversine function to find the distance betweentwo points on a sphere, specifically two zip codes in my database. I'mneither horribly familiar with SQL syntax nor math equations :), so Iwas hoping I could get some help. Below is what I'm using and it is,as best as I can figure, the correct formula. It is not however,giving me correct results. Some are close, others don't seem right atall. Any ideas?SET @lat1 = RADIANS(@lat1)SET @log1 = RADIANS(@log1)SET @lat2 = RADIANS(@lat2)SET @log2 = RADIANS(@log2)SET @Dlat = ABS(@lat2 - @lat1)SET @Dlog = ABS(@log2 - @log1)SET @R = 3956 /*Approximate radius of earth in miles*/SET @A = SQUARE(SIN(@Dlat/2)) + COS(@lat1) * COS(@lat2) *SQUARE(SIN(@Dlog/2))SET @C = 2 * ATN2(SQRT(@A), SQRT(1 - @A))/*SET @C = 2 * ASIN(min(SQRT(@A))) Alternative calculation*/SET @distance = @R * @Cthnx,cjrsumner
View 7 Replies View Related
Great Circle distance calculation
Is there any stored procedure or application that implements Great Circle distance calculation
hi everyone:
the report show two tables two matrixs
how can i control the distance between them
I want to set the same distance between the table and matrix
or (table and table )
Could I implement a failover cluster solution on the two DBs which are based in two different cities?
Possible?
I need to be able to take the latitude and logitude of two locations and compare then to determine the number of miles between each point. It doesn't need to account for elevation, but assumes a flat plane with lat and long.
Does anyone have any algorithms in T-SQL to do this?
Given the following example;
declare @CustIfno table (AccountNumber int, StoreID int, Distance decimal(14,10))
insert into @CustIfno values ('1','44','2.145223'),('1','45','4.567834'),
('1','46','8.4325654'),('2','44','7.8754345'),('2','45','1.54654323'),
('2','46','11.5436543'), ('3','44','9.145223'),('3','45','8.567834'),
('3','46','17.4325654'),('4','44','7.8754345'),('4','45','1.54654323'),
('4','46','11.5436543')
How can I show the shortest Distance by AccountID and StoreID. Results would look like this;
AccountNumberStoreID Distance
1 44 2.1452230000
2 45 1.5465432300
3 45 8.5678340000
4 45 1.5465432300
This function computes the great circle distance in Kilometers using the Haversine formula distance calculation.
If you want it in miles, change the average radius of Earth to miles in the function.
create function dbo.F_GREAT_CIRCLE_DISTANCE
(
@Latitude1 float,
@Longitude1 float,
@Latitude2 float,
@Longitude2 float
)
returns float
as
/*
fUNCTION: F_GREAT_CIRCLE_DISTANCE
Computes the Great Circle distance in kilometers
between two points on the Earth using the
Haversine formula distance calculation.
Input Parameters:
@Longitude1 - Longitude in degrees of point 1
@Latitude1 - Latitude in degrees of point 1
@Longitude2 - Longitude in degrees of point 2
@Latitude2 - Latitude in degrees of point 2
*/
begin
declare @radius float
declare @lon1 float
declare @lon2 float
declare @lat1 float
declare @lat2 float
declare @a float
declare @distance float
-- Sets average radius of Earth in Kilometers
set @radius = 6371.0E
-- Convert degrees to radians
set @lon1 = radians( @Longitude1 )
set @lon2 = radians( @Longitude2 )
set @lat1 = radians( @Latitude1 )
set @lat2 = radians( @Latitude2 )
set @a = sqrt(square(sin((@lat2-@lat1)/2.0E)) +
(cos(@lat1) * cos(@lat2) * square(sin((@lon2-@lon1)/2.0E))) )
set @distance =
@radius * ( 2.0E *asin(case when 1.0E < @a then 1.0E else @a end ))
return @distance
end
Edit: corrected spelling
CODO ERGO SUM
Hi All,
Does anyone have a Stored Procedure that works perfectly to retrieve all zipcodes within a specified zipcode and distance radius - a zipcode and radius is passed and the Store Procedure result shows all zipcodes that falls within that range.
Thanks in advance
Ade
I have the two following locations.
They're both towns in Australia , State of Victoria
Fitzroy,-37.798701, 144.978687
Footscray,-37.799736, 144.899734
After running geography::Point(Latitude, Longitude , 4326) on the latitude and longitude provided for each location, my Geography column for each row is populated with the following:
Fitzroy, 0xE6100000010C292499D53BE642C0A7406667511F6240
Footscray, 0xE6100000010C89B7CEBF5DE642C02D23F59ECA1C6240
In my SQL Query, I have the following which works out the distance between both towns. Geo being my Geography column
DECLARE @s geography = 0xE6100000010C292499D53BE642C0A7406667511F6240 -- Fitzroy
DECLARE @t geography = 0xE6100000010C89B7CEBF5DE642C02D23F59ECA1C6240 -- Footscray
SELECT @s.STDistance(@t)
The result I get is
6954.44911927616
I then looked at formatting this as in Australia we go by KM so after some searching I found two solutions one for Miles and the other KM
So I changed Select statement to look like this
select @s.STDistance(@t)/1000 -- format to KM
My result is then
6.95444911927616
When I go to google maps and do a direction request between the locations provided above it says 10.2km (depending on traffic)
Now I'm new to this spatial data within SQL, why would I get a different result from google maps?
Also I would like to round this number so its easier to use within my where statement so I'm using Ceiling as shown here:
SELECT CEILING(@s.STDistance(@t)/1000)
Is ceiling the correct way to go?
Reason I need to round this is because we are allowing the end user to search by radius so if they pass in 50km I will then say
Where CEILING(@s.STDistance(@t)/1000) < 50
I've got a working query which returns all leads within a supplied proximity to a city. I followed a tutorial I googled a couple months ago (can't find it now). It works, but would love others to look the query over (provided DDL and sample data) and tell me if it's as it should be.
Two things I don't like about query:
1. I have to do a UNION to another query that retrieves everything that is in the same city in order to have complete results.
2. very slow to retrieve results (> 1 minute)
Sample DDL: 2 tables
create table dim_lead
(
date_created datetime,
[contact_first_name] varchar(20),
[contact_last_name] varchar(20),
lead_id int,
[Code] .....
Edski writes "Help please,
below is my sql query, when I run it, I get the right result with one problem. I get same customers with same email many times. I would only like the same customer shown one time. Checking it by email.
SELECT od.pName, od.dIndx AS dindx, od.pIndx AS pindx, od.device AS device, c.Cust_Id AS cust_id,
c.First_Name AS First_name,
c.Last_Name AS last_name, c.Email AS Email, c.Phone AS phone,c.company, h.productCode AS
product_code, DATEDIFF(dd, GETDATE(), h.expirationDate)
AS Difference, h.hotSyncId AS regcode, od.autorenewal AS autorenewal, od.installment AS
installment
FROM Orders_Detail od INNER JOIN
Hot_Sync_ID h ON od.dIndx = h.dIndx INNER JOIN
Customers c ON c.Cust_Id = h.cust_id
WHERE (od.prenewal ='False') and (od.autorenewal = 'no') and (c.newsletter <> 0) AND
(DATEDIFF(dd, GETDATE(), h.expirationDate) = '27') AND (c.company <> 'University of Alberta')
ORDER BY difference, c.Last_Name, h.productCode"
Hello,
I have been working in ASP.Net web sites with Access database.
Now I want to create a web site using an MS SQL database.
What software or softwares can I use to create and edit MS SQL databases?
I am using Windows XP Professional SP2.
Thank You,
Miguel
Hello,
I have some problems to edit a recordset in an ActiveX DTS using Vbscript.
Here is an example of the script :
dim varsql, varset, varconn
set varconn = CreateObject("ADODB.Connection")
set varset = CreateObject("ADODB.Recordset")
varconn.Open = "Provider=SQLOLEDB.1;Data Source=(local);Initial Catalog=Enregistrement3;user id = 'sa';password=''"
varsql = "SELECT * "
varsql = varsql & "FROM mytable "
varset.Open varsql, varconn, 3,3
msgbox "How much : " & varset.recordcount
if varset.recordcount >0 then
do while varset.eof
varset.edit
.........................
varset.update
varset.movenext
loop
end if
varset.close
varconn.close
Does someone see what is wrong ?
I allways get -1 for the varset.recordcount ! (I checked there are some records into the table).
I don't think it is a problem of user's right as it works with the same user configuration using a SQL action requery.
If I modify the open statement like this :
varset.Open varsql, varconn, 1
varset.recordcount contains the good number of records but the recordset is read noly and can't be modified...
Any Help will be very wellcome !
TIA
This is a basic, remedial question, but I've no experience whatsoever with SQL server or Access (although I'm familiar with basic DB concepts). Even so, I have inherited this project because no one else will take it (besides, I like the challenge of learning something new :-). If I understand correctly, I can use Access 2000 to create and edit DBs on my SQL 7 server, and to run queries. This is done by creating a WBEM ODBC connector (I have no idea how this is done). I'm pretty good at figuring things out on my own, but I sure would appreciate being pointed in the right direction. What I'd like to know is first of all, am I on the right track, and secondly, what do you all recommend as a good source of info on this topic (the Microsoft web site, technet, manuals?).
All info is greatly appreciated.
thanx,
-scott
Where do I go to modify the T-SQL statement I entered while creating a job with the web assistant wizard?
View 1 Replies View RelatedI need to convert this from Jet SqL to SQL Server. Moving out of an MDB to an ADP some of the queries I need to change over, I inherited this database and the bosses want all databases moved over from MDB to ADP.
SELECT Format$([Main Table].Date,'mmmm yyyy') AS [Date By Month], [Main Table].[Action Type], Count([Main Table].[Action Type]) AS [CountOfAction Type]
FROM [Main Table]
GROUP BY Format$([Main Table].Date,'mmmm yyyy'), [Main Table].[Action Type]
HAVING (((Format$([Main Table].[Date],'mmmm yyyy'))=[Enter the Month and the Year]));
How can i mark a row with its last edit time?With access it was obvious, in sqlserver?
View 1 Replies View RelatedGreetings,Are there any tools freely available to modify or edit a .mdf databasefile? As far as seeing the actual tables?Regards,cd
View 6 Replies View Related
Two days back we have installed SP2 on SQLServer2005 Active/Active Cluster which result in failure.
Only Database Services and Analysis Services where not updated and rest of the services got updated.
After a restart , the behaviour of SQLServer is helarious.
We got into lot of problem so we opened support from Microsoft.
One of the problem i forgot to mentioed to Microsoft was on editing the Job i cannot see anything inside,all the entries where empty closing the job window and opening it again i got all my entries back but on editing i got the below mentioned Error.
Error:
Creating an instance of the COM component with CLSID {E80FE1DB-D1AA-4D6B-BA7E-040D424A925C} from the IClassFactory failed due to the following error:c001f011(Microsoft.SqlServer.ManagedDTS)
If anyone faced the same problem and got any resolution please let me know.
Anyhelp will be appriciated.
I have a many to many relationship I can design the table 2 ways:1) Category table (cat_id, cat_name, active) - cat_id as PKCategoryReq (cat_id, req_name) - cat_id & req_name as PK2)CategoryReq (req_name, cat_name) - req_name & cat_name as PKIf
I design 1st way. Then when they want to add and delete from the
CategoryRequest table, they would have to add to the category table
first. Then maybe build a list of checkboxes to select from. The one's
they check insert into the CategoryRequest table.Drawback of
this is that they can't edit the list on the fly. Since it may be used
by other request (since cat_id CategoryReq is fk into Category table)If I design it the 2nd way. Then they can edit, delete, add on the fly. But there won't be a master category list.Which way is better?
I have two questions:
1) Is it possible to rename a SQL table –or- copy the content of a table into a new table ?
2) How to replace the renamed or replaced table name inside the code of Stored Procedures that references it ?