SQL query result is not showing in R odbc-CodePudding

I am trying to run a simple query using R which is listed below. I am connected to odbc and it works fine with other queries.

MyQuery <- (dbSendQuery(conn, "Select count(ABC) FROM TABLE_1 GROUP BY YEAR(DATE_TIME)"))

When I run the above mentioned query in R environment it shows the below following result. The same query works fine in SQL Management Studio and return me the counted values.

<OdbcResult>
Rows Fetched:0 [incomplete]
Changed: 0

When I view it is shows

Name           Type                         Value
MyQuery        S4(odbc:odbcResult)    S4 Object of Class OdbcResult

Does this returns me the value location instead of actual values ?

CodePudding user response：

You're using dbSendQuery which, as its name suggests, sends the query. If you want to send and get the results in one command use dbGetQuery. dbSendQuery is good if, either, you don't care about the results or if you know/suspect the results are going to be really big and you just want to fetch them in defined sized groups using dbFetch and then clearing the results using dbClearResult

In your example you could do:

MyQuery <- (dbSendQuery(conn, "Select count(ABC) FROM TABLE_1 GROUP BY YEAR(DATE_TIME)"))
querytable <- dbFetch(MyQuery, n=100) #assuming 100 or fewer results
dbClearResult(MyQuery)

or just

querytable <- (dbGetQuery(conn, "Select count(ABC) FROM TABLE_1 GROUP BY YEAR(DATE_TIME)"))