select utc.column_name,       utc.data_type,       utc.data_length,       utc.data_precision,       utc.data_Scale,       utc.nullable,       utc.data_default,       ucc.comments,       utc.table_name  from user_tab_columns utc, user_col_comments ucc where utc.table_name = ucc.table_name   and utc.column_name = ucc.column_name   and utc.table_name in (select upper(tb.table_name)                            from all_tables tb                           where tb.OWNER = 'USER_NAME') order by column_id

注意：order by column_id的意义是使得结果按照设计数据结构时的顺序显示。

二，查询表主键

select

col.column_name

from

user_constraints con,user_cons_columns col

where

con.constraint_name=col.constraint_name and con.constraint_type='P'

and col.table_name='ONLINEXLS'

三，查询表外键

select

distinct(ucc.column_name) column_name,rela.table_name,rela.column_name column_name1

from

user_constraints uc,user_cons_columns ucc,

(select t2.table_name,t2.column_name,t1.r_constraint_name from user_constraints t1,user_cons_columns t2 where t1.r_constraint_name=t2.constraint_name and t1.table_name='ONLINEXLS') rela

where

uc.constraint_name=ucc.constraint_name

and uc.r_constraint_name=rela.r_constraint_name

and uc.table_name='ONLINEXLS'

有了上述几个SQL语句，再结合程序（如：java+jxl），就可以输出如下图所示的Excel报表了。

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