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Re: Database Challenge

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106119] Re: Database Challenge
  • From: David Reiss <dbreiss at gmail.com>
  • Date: Sat, 2 Jan 2010 05:03:52 -0500 (EST)
  • References: <hhkj95$56r$1@smc.vnet.net>

In[28]:= data = Import["/Users/dreiss/Desktop/data.csv"]

Out[28]= {{"025-60-4044 ", "       joe average "}, {"004-16-4077 ",
  "      jane doe "}, {"014-27-9076 ",
  "      mike smith "}, {"098-43-2098 ",
  "      rodolfo pilas "}, {"073-15-6005 ",
  "      gustavo boksar "}, {"004-16-4077 ",
  "      jane a. doe "}, {"147-79-9074 ",
  "      bea busaniche "}, {"165-63-0189 ",
  "      pablo medrano "}, {"124-96-7092 ",
  "      jeff aaron "}, {"004-16-4077 ",
  "      jane anne doe "}, {"172-30-6069 ",
  "      michael peters "}, {"059-85-1062 ", "      leroy baker "}}

In[31]:= First /@ GatherBy[data, First] // Length

Out[31]= 10



On Jan 1, 5:37 am, Nicholas Kormanik <nkorma... at gmail.com> wrote:
> There are 12 records in this mini database.  Two columns.  First
> column are social security numbers.  Second column are names.
> Unfortunately Jane Doe appears three times, with three different
> versions of her name, but having the same social security number.
>
> Challenge:  Remove the duplicates, where social security is the same,
> and keep any one of the names.  Final result will be whittled down to
> 10 records.
>
> (Real life problem has 6.5 million records, and lots of duplicates,
> with various versions of names.)
>
> 025-60-4044       joe average
> 004-16-4077       jane doe
> 014-27-9076       mike smith
> 098-43-2098       rodolfo pilas
> 073-15-6005       gustavo boksar
> 004-16-4077       jane a. doe
> 147-79-9074       bea busaniche
> 165-63-0189       pablo medrano
> 124-96-7092       jeff aaron
> 004-16-4077       jane anne doe
> 172-30-6069       michael peters
> 059-85-1062       leroy baker



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