Column statistics

optdiag column-level statistics include:

optdiag also prints a list of the columns in the table for which there are no statistics. For example, here is a list of the columns in the authors table that do not have statistics:

No statistics for column(s):        "address"
(default values used)               "au_fname"
                                    "phone"
                                    "state"
                                    "zipcode"