A PqConnection class object specifying the PostgreSQL connection
to OxCOVID19 Database. This is produced by connect_oxcovid19()
function
tab
A character vector specifying table name/s to extract field names
from. Must be a value included when a call to list_tables() is issued.
Default is character vector of all table names specified by
list_tables().
Value
A named list of field names per specified table available from
OxCOVID19 Database