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)
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 |
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