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Posted by jacob.dba on 06/11/47 11:43
I forgot to mention that some of the records have middle name entered
in place of first name or last name.
fname mname lname ssn
John coleman smith 1234
john smith coleman 1234
john S coleman 1234
John C Smith 1234
John Smith 1234
John-coleman Smith 1234
Smith John 1234
During the grouping process I am concerned only about fname,lname,
ssn.(no need of middle name). If there is other suggestion to include
columns I am happy to accept.
I have the idea to assign groups if one of the initial of the names is
similar with the others considering that the SSN is the same. that
means if SSN is equal and if J or S or C are there as an initial in the
names, we can say they are in the same group.
Reply
jacob.dba@gmail.com wrote:
> I have a table with first name, last name, SSN(social security number)
> and other columns.
> I want to assign group number according to this business logic.
> 1. Records with equal SSN and (similar first name or last name) belong
> to the same group.
> John Smith 1234
> Smith John 1234
> S John 1234
> J Smith 1234
> John Smith and Smith John falls in the same group Number as long as
> they have similar SSN.
> This is because I have a record of equal SSN but the first name and
> last name is switched because of people who make error inserting last
> name as first name and vice versa. John Smith and Smith John will have
> equal group Name if they have equal SSN.
> 2. There are records with equal SSN but different first name and last
> name. These belong to different group numbers.
> Equal SSN doesn't guarantee equal group number, at least one of the
> first name or last name should be the same. John Smith and Dan Brown
> with equal SSN=1234 shouldn't fall in the same group number.
>
> Sample data:
> Id Fname lname SSN grpNum
> 1 John Smith 1234 1
> 2 Smith John 1234 1
> 3 S John 1234 1
> 4 J Smith 1234 1
> 5 J S 1234 1
> 6 Dan Brown 1234 2
> 7 John Smith 1111 3
>
>
> I have tried this code for 65,000 rows. It took 20 minute. I have to
> run it for 21 million row data. I now that this is not an efficient
> code.
>
>
> INSERT into temp_FnLnSSN_grp
> SELECT c1.fname, c1.lname, c1.ssn AS ssn, c3.tu_id,
> (SELECT 1 + count(*)
> FROM distFLS AS c2
> WHERE c2.ssn < c1.ssn
> or (c2.ssn = c1.ssn and (substring(c2.fname,1,1) =
> substring(c1.fname,1,1) or substring(c2.lname,1,1) =
> substring(c1.lname,1,1)
> or substring(c2.fname,1,1) =
> substring(c1.lname,1,1) or substring(c2.lname,1,1) =
> substring(c1.fname,1,1))
> )) AS group_number
> FROM distFLS AS c1
> JOIN tu_people_data AS c3
> ON (c1.ssn = c3.ssn and
> c1.fname = c3.fname and
> c1.lname= c3.lname)
>
>
> dist FLS is distinct First Name, last Name and SSN table from the
> people table.
>
> I have posted part of this question, schema one week ago. Please refer
> this thread.
>
> http://groups.google.com/group/comp.databases.ms-sqlserver/browse_frm/thread/d2b5814cdf34c82c/f6eb380b5f2e6de6?lnk=st&q=assigning+group+number+millions&rnum=6&hl=en#f6eb380b5f2e6de6
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