目錄
23.1. 查看錶的結構
select a.column_name 字段名,
a.data_type 數據類型,
a.data_length 長度,
a.data_precision整數位,
a.data_scale 小數位,
a.nullable 允許空值,
a.data_default 缺省值,
b.comments 備註
from user_tab_columns a, user_col_comments b
where a.column_name = b.column_name
and a.table_name = b.table_name
and a.table_name = upper('emps');
23.2. 查看列的註釋
select * from user_col_comments wheretable_name = upper('emps');
23.3. 查看錶的註釋
select * from user_tab_comments wheretable_name = upper('emps');
23.4. 查看錶的約束
select * from user_constraints where table_name = upper('emps');
23.5. 查看索引
create unique index idx_unique_ename on emps(name);
select * from user_indexes where table_name= upper('emps');