tbl-sql.md
In dbplyr: A 'dplyr' Back End for Databases

sql tbl can be printed

Code
  mf2
Output
  # Source:   SQL [3 x 2]
  # Database: sqlite ?.?.? [:memory:]
        x     y
    <int> <int>
  1     1     3
  2     2     2
  3     3     1

useful error if missing I()

Code
  tbl(src_memdb(), "foo.bar")
Condition
  Error in `tbl_sql()`:
  ! Failed to find table `foo.bar`.
  i Did you mean `from = I("foo.bar")`?
  Caused by error in `db_query_fields.DBIConnection()`:
  ! Can't query fields.
  i Using SQL: SELECT * FROM `foo.bar` AS `q05` WHERE (0 = 1)
  Caused by error:
  ! no such table: foo.bar

check_from is deprecated

Code
  tbl(con, "x", check_from = FALSE)
Condition
  Warning:
  The `check_from` argument of `tbl_sql()` is deprecated as of dbplyr 2.5.0.
Output
  # Source:   table<`x`> [0 x 1]
  # Database: sqlite 3.45.0 [:memory:]
  # i 1 variable: y <lgl>