create table db_column
( tab_id                int             not null
, col_num               int             not null
, col_name              varchar(50)     not null
, col_data_type         int             not null
, col_data_type_name    varchar(50)     not null
, col_charlength        int
, col_precision         int
, col_scale             int
, col_nullity           char(1)         not null
, constraint db_column0 primary key
    ( tab_id
    , col_num
    )
)