!> dbGetQuery(conn, "SELECT col_1, col_2 FROM my_table LIMIT 0")
 data frame with 0 columns and 0 rows

!> dbGetQuery(conn, "SELECT col_1, col_2 FROM my_table LIMIT 0")
 [1] col_1 col_2
 <0 rows> (or 0-length row.names)

  > x <- dbGetQuery(conn, "SELECTT * FROM my_table")
 Error in postgresqlExecStatement(conn, statement, ...) :
   RS-DBI driver: (could not Retrieve the result : ERROR:  syntax error at or near "SELECTT"
 LINE 1: SELECTT * FROM my_table
         ^
 )
 Warning message:
 In postgresqlQuickSQL(conn, statement, ...) :
   Could not create execute: SELECTT * FROM my_table
 > str(x)
  NULL

 > x <- dbGetQuery(conn, "SELECTT * FROM my_table")
 Error in postgresqlExecStatement(conn, statement, ...) :
   RS-DBI driver: (could not Retrieve the result : ERROR:  syntax error at or near "SELECTT"
 LINE 1: SELECTT * FROM my_table
         ^
 )
!> str(x)
 Error in str(x) : object 'x' not found