[R] Extracting Data from SQL Server

[Jeff Newmiller]

This is OT here. However, you might want to investigate the UNIQUE keyword in the SQL Server documentation for SELECT.
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Sent from my phone. Please excuse my brevity.

dthomas <dyfed.thomas at midlandshn.health.nz> wrote:

>Hi, 
>
>I am new to R (and rusty on SQL!) and I'm trying to extract records
>from a
>SQL server database. I have a table of patient records (LoadPUS) which
>have
>three code columns which i want to evaluate against a list of
>particular
>codes (CVD_ICD$ table). Given the size of the patient table I want to
>restrict the data I pull into R to the data I only want to analyse so I
>am
>using SQL to do this. The code i have is as follows:
>
>library(RODBC)
>channel<-odbcConnect("NatCollections")
>query<-"SELECT UNIQUE_ID, diag01 from LoadPUS 
>WHERE (diag01 IN (SELECT [ICD-10 Codes] From CVD_ICD10$)) OR (diag02 IN
>(SELECT [ICD-10 Codes] From CVD_ICD10$))
>OR (diag03 IN (SELECT [ICD-10 Codes] From CVD_ICD10$))"
>
>This returns duplicate values, I don't want to hardcode the values
>because
>it is quite a long list. Running the "IN" function just for "diag01"
>returns
>the correct number of records, however when combining with another "IN"
>function it doesn't return the correct number of records. Can you see
>where
>my SQL is incorrect or is there another way of doing this?
>
>Much appreciated,
>D
>
>--
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