oracle檢視該使用者的所有表名字、表註釋、欄位名、欄位註釋、是否為空、欄位型別

-- oracle找出表名、表註釋、列名、列註釋、列型別、列是否null
select distinct TABLE_COLUMN.*,
                TABLE_NALLABLE.DATA_TYPE,
                TABLE_NALLABLE.NULLABLE
  from (select distinct utc.table_name  table_name,
                        utc.comments    table_comments,
                        ucc.column_name column_name,
                        ucc.comments    column_comments
          from user_tab_comments utc, user_col_comments ucc
         where utc.table_name = ucc.table_name
           and utc.table_name not like '%_B'
           and utc.table_name not like '%_Z'
           and utc.table_name not like '%1%') TABLE_COLUMN,
       (select distinct table_name, column_name, nullable, DATA_TYPE
          from user_tab_cols
         where table_name not like '%_B'
           and table_name not like '%_Z'
           and table_name not like '%1%') TABLE_NALLABLE
 where TABLE_COLUMN.column_name = TABLE_NALLABLE.column_name
   and TABLE_COLUMN.TABLE_NAME = TABLE_NALLABLE.table_name; --多次去掉笛卡爾

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