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<>一、查询表的外键（包括名称，引用表的表名和对应的键名，下面是分成多步查询）
1、查询表信息
select * from user_constraints c where c.constraint_type = 'R' and c.table_name
= 要查询的表;
说明：
constraint_type：表示约束类型，R表示外键，P表示主键
例如：
select * from user_constraints c where c.constraint_type = 'R' and c.table_name
= upper('Log_Acesso_Funcao');
2、查询外键约束的列名
select * from user_cons_columns cl where cl.constraint_name = 外键名称;
说明：
constraint_name：表示约束名称
例如：
select * from user_cons_columns cl where cl.constraint_name =
'LOGACFU_TALOGAC_FK';
<>二、查看表结构
2.1、查询表结构
SELECT table_name, column_name, data_type,DATA_LENGTH,COLUMN_ID FROM
USER_TAB_COLUMNS WHERE table_name=upper('b_notice'); SELECT * from
user_tab_columns where table_name='B_NOTICE'; SELECT * FROM all_tab_cols WHERE
table_name=upper('b_notice');
2.2、查看建表语句
select dbms_metadata.get_ddl('TABLE','B_NOTICE') from dual;
2.3、查看oracle单个数据表包含的索引
select * from user_indexes where table_name=upper('B_NOTICE');
2.4、查看哪些表哪些字段包含指定类型
SELECT table_name, column_name, data_type,DATA_LENGTH,COLUMN_ID FROM
all_tab_cols WHERE data_type=upper('NVARCHAR2')
