Oracle 一些常用的数据字典

1.查看本用户所拥有的表的名称
SELECT table_name from user_tables
SELECT * from user_objects where object_type = 'TABLE'

2.查看本用户所拥有的不同的对象类型
SELECT DISTINCT object_type
FROM user_objects

3.查看本用户所拥有的表、视图、同义词和序列
SELECT * FROM user_catalog
SELECT * FROM CAT
注：CAT 是 user_catalog的同义词

4.查看某个数据列的属性，例如默认值
select a.DATA_DEFAULT,a.*
from user_tab_columns a
where Column_name = 'DEP_ID' and TABLE_NAME='DEP_1'

5.查看某张表某数据列的约束
SELECT * FROM USER_CONSTRAINTS where Upper(TABLE_NAME)= 'DEP_1'
select * from USER_CONS_COLUMNS where TABLE_NAME='DEP_1' and COLUMN_NAME = 'DEP_ID'


6.查看某张表的索引
SELECT * FROM USER_INDEXES where Upper(TABLE_NAME)= 'DEP_1'
SELECT WMSYS.WM_CONCAT(COLUMN_NAME),TABLE_NAME,INDEX_NAME FROM USER_IND_COLUMNS
GROUP BY TABLE_NAME,INDEX_NAME
HAVING TABLE_NAME='JOB_HISTORY'

注: WMSYS.WM_CONCAT 是oracle的系统字符串聚合函数 相当于sybase的 List函数