Oracle query table index, unique constraint, field

Query the index of the table

select t.Index_Name,t.table_name,t.column_name,i.tablespace_name,i.uniqueness 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=' Upper case table name ： Lowercase table names are not supported here ';

1、 Look up all indexes of the table （ Include index name , type , Constituent column ）：
 

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 =  Table to query 

2、 Primary key of lookup table （ Include the name , Constituent column ）：
 

select cu.* from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = 'P' and au.table_name =  Table to query 

3、 Uniqueness constraints for lookup tables （ Include the name , Constituent column ）：
 

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 =  Table to query 

4、 Foreign key of lookup table （ Include the name , The table name and corresponding key name of the reference table , The following is a multi-step query ）：

select * from user_constraints c where c.constraint_type = 'R' and c.table_name =  Table to query 

Query the column names of foreign key constraints ：

select * from user_cons_columns cl where cl.constraint_name =  Name of the foreign key 

Query the column name of the key of the reference table ：

select * from user_cons_columns cl where cl.constraint_name =  The foreign key refers to the key name of the table 

5、 Query all the columns of a table and their properties

select t.*,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 =  Table to query 

Inquire about oracle List the information （ surface , Field , constraint , Indexes ）
1、 Find out all the user tables
select   *   from   user_tables   You can query all user tables
2、 Query the indexes of all tables of the user
select   *   from   user_indexes
3、 Query the index of the user table ( Nonclustered indexes ):
select   *   from   user_indexes where   uniqueness='NONUNIQUE'
4、 Query the primary key of the user table ( Clustered index ):
select   *   from   user_indexes where   uniqueness='UNIQUE'
5、 Index of query table
select t.*,i.index_type from user_ind_columns t,user_indexes i where t.index_name = i.index_name and
t.table_name='NODE'
6、 Primary key of query table
select cu.* from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and
au.constraint_type = 'P' AND cu.table_name = 'NODE'
7、 Uniqueness constraints for lookup tables （ Include the name , Constituent column ）：
select column_name from user_cons_columns cu, user_constraints au where cu.constraint_name=au.constraint_name and
cu.table_name='NODE'
8、 Foreign key of lookup table
select * from user_constraints c where c.constraint_type = 'R' and c.table_name='STAFFPOSITION'
Query the column names of foreign key constraints ：
select * from user_cons_columns cl where cl.constraint_name = Name of the foreign key
Query the column name of the key of the reference table ：
select * from user_cons_columns cl where cl.constraint_name = The foreign key refers to the key name of the table
9、 Query all the columns of a table and their properties
select t.*,c.COMMENTS from user_tab_columns t,user_col_comments c where t.table_name='NODE'