Using sqldf and RPostgreSQL together

Question

When using RPostgreSQL I find that I cannot use sqldf in the same way. For example if I load the library and read in data into a data frame using t

Answer 1

I had the same error and I detached the RPostgeSQL package, rerun my sqldf code and it worked fine r detach("package:RPostgreSQL", unload=TRUE)

Answer 2

Using sqldf with RPostgreSQL

sqldf will automatically work with the test database in PostgreSQL if it sees that RPostgreSQL is loaded. So you can create a test database in PostgreSQL and then use sqldf with that

or, you can specify the name of a different database.

See: sqldf FAQ 12

Using sqldf with RSQLite

If you want to use sqldf with RSQLite rather than with RPostgreSQL you can use sqldf's drv argument to force it use a non-default driver. e.g.

sqldf("select foo from bar...",drv="SQLite")

or, you can set the driver globally using the "sqldf.driver" option. From within R:

options(sqldf.driver = "SQLite")

or, another possibility if you wish to use RSQLite is to detach RPostgreSQL before you use sqldf and load it again afterwards.

See ?sqldf for details.