我的PostgreSQL 9.3.6
数据库中有一个名为users
的表格,其中包含两列:id
和another_id
。 id
是主键,another_id
是另一个带有唯一约束条件的整数列。
还有其他表格通过主键引用用户。
以下是users
表格的描述:
Table "public.users"
Column | Type | Modifiers | Storage | Stats target | Description
----------------------+--------------------------------+----------------------------------------+---------+--------------+-------------
id | integer | not null | plain | |
another_id | integer | not null | plain | |
Indexes:
"users_pkey" PRIMARY KEY, btree (id)
"uniq_1483a5e93414710b" UNIQUE, btree (another_id)
Referenced by:
TABLE "foo_table" CONSTRAINT "fk_4affc6e5a76ed395" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
TABLE "bar_table" CONSTRAINT "fk_72936b1da76ed395" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
TABLE "baz_table" CONSTRAINT "fk_83adbaf0a76ed395" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
这是 foo_table
的描述:
Table "public.foo_table"
Column | Type | Modifiers | Storage | Stats target | Description
--------------+--------------------------------+-----------------------------------------------+----------+--------------+-------------
id | integer | not null | plain | |
user_id | integer | | plain | |
Indexes:
"foo_table_pkey" PRIMARY KEY, btree (id)
"idx_e52ffdeea76ed395" btree (user_id)
Foreign-key constraints:
"fk_e52ffdeea76ed395" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
如何将PostgreSQL表中的主键从id
列替换为another_id
列,并保持数据完整性?
id
列,并用another_id
替换它,还是两者都要保留?如果两者都要,请将主键“重定向”到another_id
还是不需要? - MatheusOl