Why table variable SQL doesn't return values in R Markdown?

Question

Can't understand why R Markdown doesn't return values for table variable SQL? I use notebook in R Studio.

For example:

declare @CountriesTable as TABLE (countries varchar(2))
        insert into @CountriesTable values ('us'), ('gb'), ('de'), ('fr')
 
 select * from @CountriesTable

in MSSMS returns

In R Markdown I get 0 Rows:

Answer 1

1. Your statement "does not work with non-numeric data" is quite wrong, DBI (with SQL Server) supports SQL Server's bit , integer , float variants, datetimeoffset variants, char / varchar / nchar / nvarchar variants, etc.

2. Suggested here , add SET NOCOUNT ON .

Demonstration:

---
title: Why table variable SQL doesn't return values in R Markdown?
---

```{r setup}
library(DBI)
con <- DBI::dbConnect(odbc::odbc(), ...) # redacted
```

```{sql connection=con}
set nocount on
declare @CountriesTable as TABLE (countries varchar(2))
insert into @CountriesTable values ('us'), ('gb'), ('de'), ('fr')
select * from @CountriesTable
```

Ultimately, I believe the issue is that DBI does not deal with with multiple result-sets. While I had expected that odbc 's PR 345 would have addressed this in odbc-1.3.0, it does not seem to deal correctly with the first resultset ( 4 , number of rows inserted) and the second (four rows of data).