Question

我有一张如下所示的表格

mysql> desc cust_vend_relation ;

+-----------------------+--------------+------+-----+---------+----------------+
| Field                 | Type         | Null | Key | Default | Extra          |
+-----------------------+--------------+------+-----+---------+----------------+
| customer_id           | int(11)      | YES  |     | NULL    |                |
| vendor_id             | varchar(50)  | YES  | MUL | NULL    |                |
| address_label         | varchar(50)  | YES  |     | NULL    |                |
| vendor_name           | varchar(50)  | YES  |     | NULL    |                |
| cust_ven_id           | int(11)      | NO   | PRI | NULL    | auto_increment |
| city                  | varchar(50)  | YES  |     | NULL    |                |
| ----------------------+--------------+------+-----+---------+----------------+

示例数据：

mysql> select customer_id , vendor_id , address_label , vendor_name ,cust_ven_id ,city from cust_vend_relation;
+-------------+------------+---------------+----------------+-------------+----------------+
| customer_id | vendor_id  | address_label | vendor_name    | cust_ven_id | city           |
+-------------+------------+---------------+----------------+-------------+----------------+
|         267 | 5000821693 | Office        | Imax Vendor 01 |         247 | Hyderabad      |
|         266 | 5000821693 | office        | Imax Vendor 01 |         256 | Hyderabad      |
|         266 | 5000821693 | home          | Imax Vendor 01 |         258 | Hyderabad      |
|         266 | 5000821693 | ttttt         | Imax Vendor 01 |         260 | Hyderabad      |
|         272 | 5000821693 | home          | Imax Vendor 01 |         261 | Hyderabad city |
|         270 | 5000821693 | Haii          | Imax Vendor 01 |         262 | Hyderabad city |
+-------------+------------+---------------+----------------+-------------+----------------+

根据表结构，我没有任何主键，我可以依赖它来说明它是否重复（我可以说的唯一情况是 address_label 和 vendor_id 列可以重复）

请您告诉我如何在这种情况下使用插入或更新？

INSERT INTO cust_vend_relation (customer_id, vendor_id, address_label,vendor_name,city) 
VALUES (267, 5000821693, 'office' , 'Imax Vendor 01' , 'Hyderabad') ON DUPLICATE KEY

Answer 1

您可以使用两列唯一约束（address_label，vendor_id）...
你有cust_ven_id作为主键！

Answer 2

根据您的示例数据，候选唯一键将是列customer_id, vendor_id, address_label的三元组。如果这些列（或其他一些集合）确实保证是唯一的，那么在它们上创建一个唯一索引：

create unique index idx_ cust_vend_relation_3 on cust_vend_relation(customer_id, vendor_id, address_label);

然后，您可以将insert表达为：

INSERT INTO cust_vend_relation (customer_id, vendor_id, address_label, vendor_name, city) 
    VALUES (267, 5000821693, 'office' , 'Imax Vendor 01' , 'Hyderabad')
    ON DUPLICATE KEY
       UPDATE vendor_name = VALUES(vendor_name),
              city = VALUES(city);

如何插入OR基于自定义复合主键更新行

2 个答案: