# SQL 2012 :: How To Calculate The Distance In Miles

Oct 15, 2015

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.

## T-SQL (SS2K8) :: Returning Rows Within Certain Distance In Miles From City Using Longitude And Latitude

Nov 19, 2014

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
(
date_created datetime,
[contact_first_name] varchar(20),
[contact_last_name] varchar(20),

[Code] .....

## T-SQL (SS2K8) :: Calculation - Get Records Based On 100 / 80 / 60 / 40 Miles Radius

Feb 9, 2015

I have zip code database and i am trying to get the records based on 100/80/60/40 miles radius. Below the sample structure of my table

Create table ZipCodes(ID bigint primary key identity(1,1),ZipCode varchar(10),
Address varchar(4000), city varchar(50),state varchar(50),Latitude float,Longitude float)If i pass the Zipcode as '10021'

I need to get zipcodes and other details of my table which is 20 mile radius circle.

I Google through and got couple of article explains about using Haversine Formula. Also, following link has a function to calculate the distance.

## SQL 2012 :: Calculate (Number Of Days To Pay) Logic

Jun 24, 2014

How to write a query that calculate the number of days (approx) that it takes to a customer to pay an invoice.

Document Types

1 Payment
2 Invoice
3 Credit Memo
4 Finance Charge Memo
5 Reminder
6 Refund

There are three methods to consider when calculating the days to pay logic.

Method 1 - Simple : Look for Document Type 2 (Invoice), if "closed at date" > "posting date" then number of days = ("closed at date" - "posting date")

Method 2 - A Document Type 1 (payment) closes a Document Type 2 (Invoice)
For this method the formula would be: Payment Record (1) "posting date" - Invoice Record (2) "posting date"

Method 3 - An Invoice closes the payment.

On a payment entry “closed by entry no.” refers to an Invoice entry.

a. In our code we are not on the payment looking for the invoice, we are on the invoice.
i. Because of this we need to find the entry that our current invoiced has closed.

I am taking this from a page that has the pascal code that I need to translate to SQL.

IF (CustLedgEntry2."Document Type" = CustLedgEntry2."Document Type"::Invoice) AND
NOT CustLedgEntry2.Open
THEN
IF CustLedgEntry2."Closed at Date" > CustLedgEntry2."Posting Date" THEN
UpdateDaysToPay(CustLedgEntry2."Closed at Date" - CustLedgEntry2."Posting Date")

[Code] ....

I am also including create table and insert data scripts ...

## SQL 2012 :: How To Calculate Date Difference In Months

Jan 23, 2015

I would like to calculate difference between end_date and current date in Months.And also how we can calculate the sum of difference in months between start_date and end_date for each ID?

CREATE TABLE datedifference (
id INT
,start_date INT
,end_date INT
)
INSERT INTO datedifference VALUES (10,20091202,20100629)
INSERT INTO datedifference VALUES (20,20071202,20090330)
INSERT INTO datedifference VALUES (30,20051202,20101031)

## SQL Server 2012 :: Calculate Total Between Two Columns

Sep 14, 2015

I have update schema and I upload image with my desire result.

CREATE TABLE #NONAMETABLE(
sinGroup NVARCHAR(10)
,column1 INT
,column2 int

[Code] .....

## SQL Server 2012 :: Calculate EndDate From Subsequent StartDate

Jul 28, 2014

Here is sample data I am working with:

Create table cattimelines (categoryID int, EffectiveDate datetime, CategoryValue varchar(11))

INSERT INTO cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-01-01', 'A')
INSERT INTO cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-02-01', 'B')
INSERT INTO cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-04-01', 'C')
INSERT INTO cattimelines(categoryID, EffectiveDate, CategoryValue) VALUES(1000, '2014-07-01', 'A')

I need to calculates a term date for each record which will be 1 day before the effective date of any new record, thus:

CATEGORYIDEFFECTIVEDATETERMDATECATEGORYVALUE

10002014-01-012014-01-31A
10002014-02-012014-03-21B
10002014-04-012014-06-30C
10002014-07-01NULLA

## SQL Server 2012 :: Calculate Age Of Various Students In School System

Aug 31, 2014

In a sql server 2012 database, I have a field called date of birth that is stored in a tha that is stored in a datetime format. I need to determine the age of various students in the school system. Thus can you show me sql to that I can use to determine the a child is currently?

## SQL Server 2012 :: Calculate Customers Age And Value By Month And Year?

Sep 22, 2014

What's the best way to calculate a customers age and value by month and year?

I need to be able to calculate customer value by month and year, and then to calculate their age at each month in time. I've found a way of grouping sales by month and year that includes age for a particular contact like this:

select fh.contact_number
, concat(year(fh.transaction_date), '-', month(fh.transaction_date)) as transaction_month_year
, cast(fh.transaction_date as date) as transaction_date
, sum(fh.amount) as ttl_amount_in_month

[Code] .....

It seems to work, but any better way to achieve this?

## SQL 2012 :: Calculate Time Difference For Consecutive Rows?

Jul 2, 2015

I have a table like this.

CREATE TABLE Table1
([S_ID] varchar(7), [S_ACTV_CODE] varchar(4), [S_USER] varchar(5), [S_DATETIME] varchar(19), [S_ACT_IND] int)
;
INSERT INTO Table1
([S_ID], [S_ACTV_CODE], [S_USER], [S_DATETIME], [S_ACT_IND])
VALUES
('AAA-111', NULL, 'USER1', '2015-06-15 00:21:06', 0),
('AAA-111', '2', 'USER1', '2015-06-15 00:21:07', 0),

[code]....

Basically I want to calculate the time spent by S_Users on a particular S_ACTV_CODE:

- S_ACTV_CODE_PREV means the previous active records.

- S_START_TIME is the time of S_DATETIME when a S_ACTV_CODE starts

- S_END_TIME is the time before a S_ACTV_CODE changes to another S_ACTV_CODE

- For the first record, S_ACTV_CODE is null, so there is no S_ACTV_CODE_PREV, so S_ACTV_CODE_PREV is NULL

- For the second record S_ACTV_CODE has some value, but S_ACTV_CODE_PREV is NULL for first record. So second record S_ACTV_CODE_PREV is also NULL

- For the last record (means S_ACTV_IND = 1), the user is currently working on it and S_ACTV_CODE is not changed. So S_END_TIME is a open time and we want to keep it as NULL

So the result should be as below:

S_ID S_ACTV_CODE_PREV S_ACTV_CODE_CURR S_USER S_START_TIME
S_END_TIME TIME_SPENT (in Sec)
AAA-111 NULL NULL USER1 2015-06-15 00:21:06
2015-06-15 00:21:07 1
AAA-111 NULL 2 USER1 2015-06-15 00:21:07
2015-06-17 03:20:33 183566
AAA-111 2 4 USER2 2015-06-17 03:20:33

[code]....

## SQL Server 2012 :: How To Calculate Dates Difference In A Same Table

Sep 4, 2015

I have a table with appdt as first appointment date and the another record for the same customer# has follow up appointment.

Each customer is uniquely identified by a customer#

I need to find out if the customer came back after 200 days or more when the first appointment date was between jan12014 and Aug 31 2014. I am only interested in first follow up appointment after 30 days or more.

How can i do that in a query?

## SQL Server 2012 :: Calculate Total On-peak And Off-values For A Month

Nov 25, 2014

SQL query to calculate the total on-peak and off-values for a month as well as the Max/highest on-peak/offPeak hourly value for that month.

On a daily basis i store the hourly values of the meter in a SQL table.

On-Peak

Summer: Apr-Oct hours(7-22) on weekdays (M-F)
Winter: Nov-Mar hours(8-23) on weekdays (M-F)

off-Peak

Summer: Apr-Oct hours(0-6,23,24); Weekends (Saturday & sunday) ; all public holidays during those months as to be considered as off peak

Winter: Nov-Mar hours(0-7,24);Weekends (Saturday & sunday); all public holidays during those months as to be considered as off peak

Here is the DB Table Structure:

Column Name & Data Types
HourId - Uniqueidentifier
CustomerName - nvarchar(50)
IntegratedHour - TinyInt
Generation - Decimal (18,4)
LastModified - Datetime
ModifiedBy - nvarchar(50)

## SQL 2012 :: Calculate Stock Aging Based On Hand Quantity

Jan 18, 2015

I want to calculate stock aging (qty, cost) based on the on hand quantity.

Currently I am recording only in/out transaction only.

For ex: Item A i have 115 pieces (Balance stock) as on to day.

Transaction History
---------------------
Lot 1 - 01/01/2015 - 50
Lot 2 - 10/02/2015 - 50
Lot 3 - 11/03/2015 - 50
Lot 4 - 15/04/2014 - 50

I want to calculate cost of balance qty as shown below.

Jan -
Feb - 15 @ 1.1
Mar - 50 @ 0.90
Apr - 50 @ 1.2

Database schema
--------------------
CREATE TABLE [dbo].[StockManagement](
[Uniid] [int] IDENTITY(1,1) NOT NULL,
[StockCode] [int] NULL,
[TransactionDate] [datetime] NULL,
[TransactionTime] [time](0) NULL,

[Code] .....

## SQL Server 2012 :: Calculate Elapsed Time And Display As Row In Results

Jun 19, 2015

I am trying to calculate the time difference between the value in the row and the min value in the table. So say the min value in the table is 2014-05-29 14:44:17.713. (This is the start time of the test.) Now say the test ends at 2014-05-29 17:10:17.010. There are many rows recorded during that start and end time, for each row created a time stamp is created. I am trying to calculate the elapsed time and have it as a row in the results.

min(timestamp) - timestamp(value in row) = elapsed time for that test
where Channel = '273'

Here is the table DDL

CREATE DATABASE SpecTest;
USE SpecTest
GO

CREATE TABLE [dbo].[Spec1](
[Spec1ID] [int] IDENTITY(1,1) NOT NULL,
[Channel] [int] NOT NULL,

[Code] ....

Here is some dummy data to use

INSERT INTO Spec1 (Channel, Timestamp, Lambda, Power)
VALUES(273, '2014-05-29 14:44:17.713', 800, '-64.91');
INSERT INTO Spec1 (Channel, Timestamp, Lambda, Power)
VALUES(273, '2014-05-29 15:05:09.507', 800, '-59.11');
INSERT INTO Spec1 (Channel, Timestamp, Lambda, Power)

[Code] ....

Example desired results (I hope the formatting works)

Channel | Timestamp | Lambda | Power | Elapsed_Time
______________________________________________________________
273 | '2014-05-29 14:44:17.713', | 800, | '-64.91' | 0
273 | '2014-05-29 15:05:09.507', | 800, | '-64.91' | 00:20:51
273 | '2014-05-29 15:26:00.520', | 800, | '-64.91' | 00:41:42
273 | '2014-05-29 16:28:34.213', | 800, | '-64.91' | 01:44:16
273 | '2014-05-29 16:49:25.853', | 800, | '-64.91' | 02:05:08
273 | '2014-05-29 17:10:17.010', | 800, | '-64.91' | 02:25:59

## SQL 2012 :: Check Columns Before Process And Calculate Size In Byte In SSIS

Apr 10, 2014

I need find out the number of columns in flat file before i process that particular file.

I have file name in @filename variable and file path is @filepath variable.

But do not not that how i will check the column name in before i will process that file.

@filePath = C:DatabaseSourceFilesCAHCVSSourceFiles

And I am using for each loop container to read the file one by one and put the file name in @filename variable.

and my file name like

Product_20120607060930.txt
Product_20130708060930.txt

My file structure is:

ID,Name,City,Country,Phone
1,Riya,Pune,India,454564
2,Jiya,New Jersey,India,454564
3,Riya,St Louis,USA,454564
4,Riya,Belleville,USA,454564
5,Riya,Miami,USA,454564

Now what i have to do is i need to make sure that ID,Name,City,County,Phone is there in flat file. if it is not there then i have to send mail to client saying that file is not valid.

Let me know how i will do it.I need to also calculate the size of flat file.

## SQL 2012 :: Calculate TempDB Size For Read Committed Snapshot Enabled

Apr 14, 2014

I receive Error: 3967, Severity: 17, State: 1. Insufficient space in tempdb to hold row versions. We have 8 data files for temp db of 10210 GB size and given 10240 GB as max size.

As MS suggest to calculate the temp db file size and growth rate we need to monitor the perform counters Free Space in Tempdb (KB) and Version Store Size (KB) in the Transactions object.

basic formula: [Size of Version Store] = 2 * [Version store data generated per minute] * [Longest running time (minutes) of your transaction

My report disk utilizations says tempdb is full ? I thonk I need a shrink for the file .

Still I am confused in calculating the size , My perform counter gives me data as such

Free Space in tempdb (KB)               279938496
Version Generation rate (KB/s)           53681040
Version Cleanup rate (KB/s)       53422320
Version Store Size (KB)      258720
Version Store unit count        22
Version Store unit creation                      774
Version Store unit truncation         752

## SQL Server 2012 :: Dynamic Pivot Statement To Calculate And Organize Columns

Mar 11, 2015

How to write a Dynamic Pivot Statement to Calculate and Organize Columns like:

CREATE TABLE #mytable
(
Name varchar(50),
GA int,
GB int,
startdate DATETIME,
enddate DATETIME

[Code] ...

Below is Our Sample Table Data.

Name GAGBstartdateenddate
Pavan 261/1/20151/1/2015
Hema 561/1/20151/1/2015
Surya 501/1/20151/1/2015
Pavan 811/2/20151/8/2015
Hema 311/2/20151/8/2015
Surya 121/2/20151/8/2015
Pavan 1041/9/20151/15/2015
Hema 301/9/20151/15/2015
Surya 6131/9/20151/15/2015

How to write Pivot Satement to get Oupt like below:

1/1/2015 Pavan Hema Surya SumTotal
Total 8 11 5 24
GA 2 5 5 12
GB 6 6 0 12

1/8/2015 Pavan Hema Surya SumTotal
Total 9 4 3 16
GA 8 3 1 12
GB 1 1 2 4

1/15/2015 Pavan Hema Surya SumTotal
Total 14 3 19 36
GA 10 3 6 19
GB 4 0 13 17

## SQL Server 2012 :: How To Calculate Attendance For Single Student For Yearly Basis

Jul 2, 2015

I have to calculate the Total number of days present and absent for a singel student.

AS of now i have 3 tables.

2.Student details - Columns - [Guid],[FullName],[DOB],[Address]
3.Class Details - Columns - [Guid],[AcademyId],[Class],[Section],[Startdate],Enddate]

So now i have loaded all the data into the table.

I can fetch the counts for total present and absent

Query i have tried is

Declare
@StudentId Uniqueidentifier ='0B2D4D41-8D33-4D79-A981-03E0F093F458'
Begin
select A.StudentId ,A.Date,Count(Date)Total,B.Guid,

[Code] ....

AS result of this query i get the data.Present count and Absent count from date inserted in Dailyattendance tables.

SO my problem is if the student have promoted to next class then by this query it will count the before year also how do i need to calculate the count according to the Class StartDate and Enddate as i mention in the Class Details table what will be the query.

## SQL Server 2012 :: Calculate Number Of Days From A Date - Exclude Weekends And Holidays

Feb 2, 2014

I have already created a table name 'tblHolidays' and populated with 2014 Holidays. What I would like is be able to calculate (subtract or add) number of days from a date. For example subtract 2 days from 07/08/2014 and function should return 07/03/2014.

CREATE FUNCTION [dbo].[ElapsedBDays] (@Start smalldatetime, @End smalldatetime)
RETURNS int
AS
BEGIN
/*
Description:
Function designed to calculate the number of business days (In hours) between two dates.

[Code] ......

## SQL Server 2012 :: Calculate Number Of Groups And Group Size With Multiple Criteria

Jun 15, 2015

I need to calculate the last two columns (noofgrp and grpsize) No of Groups (count of Clientid) and Group Size (number of clients in each group) according to begtim and endtime. So I tried the following in the first Temp table

GrpSize= count(clientid) over (partition by begtime,endtime) else 0 end
and in the second Temp Table, I have
select
,GrpSize=sum(grpsize)
,NoofGrp=count(distinct grpsize)
From Temp1

The issue is for the date of 5/26, the begtime and endtime are not consistent. in Grp1 (group 1) all clients starts the session at 1030 and ends at 1200 (90 minutes session) except one who starts at 11 and end at 1200 (row 8). For this client since his/her endtime is the same as others, I want that client to be in the first group(Grp1). Reverse is true for the second group (Grp2). All clients begtime is 12:30 and endtime is 1400 but clientid=2 (row 9) who begtime =1230 but endtime = 1300. However, since this client begtime is the same as the rest, I wan that client to be in the second group (grp2) My partition over creates 4 groups rather than two.

## SQL Server 2012 :: Calculate Failure Rates Of Systems Based On Cases Opened Through Support

Jun 5, 2014

I am trying to build a query which will be used in an automated report to calculate failure rates of systems based on cases opened through support. Here is where I am stuck. Some systems may have multiple cases opened within the same span of another cases however we would consider this one failure:

System ACase12013-07-11 13:17:09.0002013-07-15 12:05:03.000
System ACase22013-07-12 16:27:50.0002013-07-12 16:29:12.000
System ACase32013-07-12 17:30:32.0002013-07-12 17:40:11.000
System ACase42013-07-12 19:00:24.0002013-07-12 19:04:14.000
System ACase52013-10-01 18:02:23.0002013-10-01 18:11:26.000

Lets say System A generated those 5 cases however Case 2,3 and 4 all happened within the same period as Case 1 so those 4 cases should count as one failure so my end result should be

System ACase12013-07-11 13:17:09.0002013-07-15 12:05:03.000
System ACase52013-10-01 18:02:23.0002013-10-01 18:11:26.000

And that system should show me 2 failures. I was thinking of using a temp table but not sure if that is possible as I am stumped on how to compare the dates to be able to validate if they fall within the range of an older case and whether or not to include them into the new Temp Table.

## SQL 2012 :: Produce Report To Calculate No Of Days Based On User Input Start And End Date

Jan 5, 2015

I have to produce a report to calculate no of days based on user input start date and end date.

say for eg: in the tables I have emp name
user 'Phani' started work from - EStart 20/11/2014EEnd 10/01/2015 - total days --datediff
within his work period he did different roles:

PhaniMarketing (prSt Date) 20/11/2014prE date (28/11/2014) Total 9 days
PhaniAdmin (prSt Date) 29/11/2014prE date (20/12/2014) Total 22 days
PhaniCRM (prSt Date) 20/12/2014prE date (10/01/2015) Total 22 days
Total days 53 Days
for this :

[code]...

HOW CAN I USE Case statement to calculate days for given start date and end date. I have to include all three totals, 1 for Job dates, 2, subjobs dates, 3 cal of days for a requested period.

## SQL Server 2012 :: Calculate Number Of Days Based On Computer System Date And Due Date Row

Mar 18, 2014

I have a query to run a report where the results has a column named “Due Date” which holds a date value based on the project submission date.Now, I need to add 4 columns named, “45 Days Expectant”, “30 Days Overdue”, “60 Days Overdue” and “90 Days Overdue”.I need to do a calculation based on the “Due Date” and “System (I mean default computer date) Date” that if “System Date” is 45 days+ to “Due Date” than put “Yes” in “45 Days Expectant” row.

Also, if “Due Date” is less than or equal to system date by 30 days, put “Yes” in “30 Days Overdue” and same for the 60 and 90 days.how to write this Case Statement? I have some answers how to do it in SSRS (Report Designer) but I want to get the results using T-SQl.

## Nearest Distance

Jan 21, 2004

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

## Mirroring Over Distance????

Mar 1, 2007

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.

## Edit Distance

Mar 18, 2008

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

## Help W/ Distance Calculation Query

Mar 28, 2007

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.

## Distance Between Postal Codes

Jul 23, 2005

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!

## Database Mirrors Over Distance

Mar 20, 2007

Various 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?

## Cluster Euclidean Distance

Mar 27, 2007

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.

## Distance Between Two Points Lat/long

Jan 12, 2008

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 @Ans as float
declare @Miles as float

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 @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

Oct 15, 2007

Great Circle distance calculation
Is there any stored procedure or application that implements Great Circle distance calculation

## Find Data Within 10m Distance Of Coordinates?

Nov 22, 2013

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.