select * from user_tables t,user_tab_comments c
where c.
and t.table_name = '表名'
2. 查询表的所有列及其属性
select t.COLUMN_NAME,
t.DATA_LENGTH,
t.DATA_PRECISION,
t.NULLABLE,
t.COLUMN_ID,
c.COMMENTS
from user_tab_columns t, user_col_comments c
where t.table_name = c.table_name
and t.column_name = c.column_name
and t.table_name = '表名'
order by t.COLUMN_ID ;
3 . 查找表的主键(包括名称,构成列)
select cu.*,c.DATA_TYPE
from user_cons_columns cu, user_constraints au,user_tab_columns c
where cu.constraint_name = au.constraint_name
and c.COLUMN_NAME = cu.column_name
and c.TABLE_NAME = cu.table_name
and au.constraint_type = 'P'
and au.table_name = '表名'
4 . 查找表的所有索引(包括索引名,类型,构成列)
select t.*, i.index_type
from user_ind_columns t, user_indexes i
where t.index_name = i.index_name
and t.table_name = i.table_name
and t.table_name = '表名'
select column_name
from user_cons_columns cu, user_constraints au
where cu.constraint_name = au.constraint_name
and au.constraint_type = 'U'
and au.table_name = '表名'
6. 查找表的外键(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)
select *
from user_constraints c
where c.constraint_type = 'R'
and c.table_name = '表名'
7. 查询外键约束的列名
select * from user_cons_columns cl where cl.constraint_name = '外键名称'
8.查询引用表的键的列名
select * from user_cons_columns cl where cl.constraint_name = '外键引用表的键名'