PgSQL                    Return an object of type PgSQL
dbAppendTable.PgSQL.conn
                         Append data to a PgSQL table
dbClearResult.PgSQL.result
                         Clear results
dbColumnInfo.PgSQL.result
                         Return column information
dbConnect.PgSQL          Connect to PostgreSQL backend
dbConnectionInfo.PgSQL.conn
                         Return connection information
dbDisconnect.PgSQL.conn  Drop a connection
dbGetQuery.PgSQL.conn    Submit a query and fetch result
dbGetResult.PgSQL.result
                         Fetch results from a query
dbListTables.PgSQL.conn  List tables in a database
dbReadTable.PgSQL.conn   Read a PostgreSQL table
dbResultInfo.PgSQL.result
                         Get result information
dbSendQuery.PgSQL.conn   Send a query to the backend
dbWriteTable.PgSQL.conn  Write a data frame to a database
Internal functions       Internal function
psql                     Run the PostgreSQL monitor
