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create table db_column
( tab_id                int             not null
, col_num               int             not null
...
    , col_num
    )
)

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my $addcol = $dbh->prepare(
    "insert into db_column
    ( tab_id
...
        $ck->{scale},
        ($ck->{nullity}? 'Y' : 'N'))
                or warn "Couldn't insert into db_column: $DBI::errstr"
+;