Oracle查询数据表结构SQL

select
    A.column_name  ,A.data_type  ,A.data_length  ,A.data_precision  ,
    A.Data_Scale  ,A.nullable  ,A.Data_default  ,B.comments  ,
    C.IndexCount  
from
    user_tab_columns A,
    user_col_comments B,
    (select count(*) IndexCount,Column_Name from User_Ind_Columns where Table_Name = 'T_TFM_CROSSDIR_15M_FLOW' group by Column_Name) C
where
    A.Table_Name = B.Table_Name
    and A.Column_Name = B.Column_Name
    and A.Column_Name = C.Column_Name(+)

    and A.Table_Name = 'T_TFM_CROSSDIR_15M_FLOW'

select
    A.column_name 字段名,A.data_type 数据类型,A.data_length 长度,A.data_precision整数位,
    A.Data_Scale 小数位,A.nullable 允许空值,A.Data_default 缺省值,B.comments 备注,
    C.IndexCount 索引次数
from
    user_tab_columns A,
    user_col_comments B,
    (select count(*) IndexCount,Column_Name from User_Ind_Columns where Table_Name = ''''TABLE_TEST'''' group by Column_Name) C
where
    A.Table_Name = B.Table_Name
    and A.Column_Name = B.Column_Name
    and A.Column_Name = C.Column_Name(+)
    and A.Table_Name = ''''TABLE_TEST''''