How to show the schema of a table include the constraints in Oracle?

Question

describe table_name

没有显示约束，有没有办法做到这一点？

Answer 1

使用DBMS_METADATA包，如此处所述 。

Answer 2

You can use system views. Eg user_* or all_tab_columns and all_cons_columns. Try like this:

SELECT tc.column_id, tc.table_name, tc.column_name, tc.data_type, cc.constraint_name 
  FROM user_tab_columns tc,
       user_cons_columns cc
WHERE  tc.table_name = cc.table_name(+)
  AND  tc.column_name = cc.column_name(+)
  AND  tc.table_name = 'YOU TABLE NAME THERE'
ORDER BY tc.column_id

Answer 3

You need to query the USER_CONS_COLUMNS view to see the table columns and it constraints.

SELECT *
FROM   user_cons_columns
WHERE  table_name = 'TABLE_NAME';