Question

我正在尝试替换单个表中的列数据。

有表'catalog_category_product'：

'position'，'old_position'，'category_id'，'product_id'。

仅当category_id = 9时，我才想将“ old_position”替换为“ position” 这是我的查询：

UPDATE catalog_category_product
SET catalog_category_product.old_position = 

( 
 select position
  FROM (select * from catalog_category_product) AS m2
WHERE category_id = 110
) 
WHERE category_id = 9`

Answer 1

尝试一下：

Update catalog_category_product as c1, catalog_category_product as c2 set c1.old_position = c2.position where c2.category_id = 110 and c1.category_id = 9

Answer 2

UPDATE catalog_category_product AS t1 INNER JOIN catalog_category_product AS t2 
          ON t1.product_id = t2.product_id
          SET t1.old_position = t2.position
          WHERE t1.category_id = {{$parentCategory}} AND t2.category_id  = {{$childCategory}

对我有用

多行更新麻烦mysql

2 个答案: