tbl_sql function

Create an SQL tbl (abstract)

Generally, you should no longer need to provide a custom tbl()

method. The default tbl.DBIConnect method should work in most cases.

tbl_sql(subclass, src, from, ..., vars = NULL, check_from = deprecated())

Arguments

• subclass: name of subclass
• ...: needed for agreement with generic. Not otherwise used.
• vars: Provide column names as a character vector to avoid retrieving them from the database. Mainly useful for better performance when creating multiple tbl objects.
• check_from: