如何更新具有约束的表中的值？
示例表：ID_REL
id | other_id
-----------
1 | 123
-----------
2 | 456
-----------
3 | 123
列ID和其他_ID有一个约束。该表是一个关系表。我想将所有“ 123”值更新为表中已经存在的“ 456”。我尝试过这样简单的事情：
UPDATE id_rel
SET other_id = 456
WHERE other_id = 123;
当我尝试以上时，我会收到以下错误的消息：
ERROR: duplicate key value violates unique constraint "id_rel" Detail: Key (id, other_id)=(1, 456) already exists.
如何更改这些值而无需必须删除约束并基本上重建表？
Example Table: id_rel
id | other_id
-----------
1 | 123
-----------
2 | 456
-----------
3 | 123
There is a constraint on columns id, and other_id. The table is a relation table. I'd like to update all '123' values to '456' which already exist in the table. I've tried something as simple as:
UPDATE id_rel
SET other_id = 456
WHERE other_id = 123;
When I try the above I get a message like the following error:
ERROR: duplicate key value violates unique constraint "id_rel" Detail: Key (id, other_id)=(1, 456) already exists.
How can I change these values without having to remove the restraints and basically rebuild the table?
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密钥“ 456”是独特的约束，并且此约束已为另一个记录而已。
您必须合并两个记录或删除占据约束值的记录
The key "456" as an unique constraint and this constraint allready exist for a another record.
You have to merge the two record or delete the one who occupy the constraint value