select t.*,c.COMMENTS from user_tab_columns t,user_col_comments c where t.table_name = c.table_name and t.column_name = c.column_name and t.table_name = '表名'　　

select t.*,i.index_type from user_ind_columns t,user_indexes i where t.index_name = i.index_name and t.table_name = i.table_name and t.table_name = '表名'

select 'CREATE ' ||un||' INDEX '||INDEX_NAME||' on '||TABLE_NAME||' ('||ltrim(max(sys_connect_by_path(COLUMN_NAME, ',')),',')||')'

   from(select t.table_name,t.INDEX_NAME,t.COLUMN_POSITION,t.COLUMN_NAME,case when i.UNIQUENESS ='UNIQUE' then 'UNIQUE ' else ' ' end un,

   i.index_type from user_ind_columns t,user_indexes i where t.index_name = i.index_name

   and t.table_name = i.table_name and t.table_name = '表名'

   and not exists(select 1 from user_cons_columns c where c.constraint_name = t.index_name and c.table_name = t.table_name))

   start with COLUMN_POSITION = 1 connect by COLUMN_POSITION- 1 = PRIOR COLUMN_POSITION and INDEX_NAME = PRIOR INDEX_NAME

   group by table_name,INDEX_NAME,un;

select cu.* from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = 'P' and au.table_name = '表名'

SELECT 'ALTER TABLE ' || TABLE_NAME || ' ADD CONSTRAINT ' || CONSTRAINT_NAME ||

  ' PRIMARY KEY (' || ltrim(max(sys_connect_by_path(COLUMN_NAME, ',')),',') || ')'

   FROM(select  cu.table_name,cu.constraint_name,cu.column_name,cu.position

   from user_cons_columns cu, user_constraints au

   where cu.constraint_name = au.constraint_name and au.constraint_type = 'P'

  and au.table_name = '表名' )start with position = 1 connect by position- 1 = PRIOR position

   and CONSTRAINT_NAME = PRIOR CONSTRAINT_NAME group by  table_name,constraint_name;