Question

我正在尝试根据MySQL查询获取更新一个表列。问题是两列中的查询结果，但我只需要更新类别列。

not_categorized

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| id | category_lookup      | category1          |
--------------------------------------------------
| 1  | Chino                | *to be found*      |
--------------------------------------------------
| 2  | Rainjacket           | *to be found*      |
--------------------------------------------------

title_match

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| id | title                | category1          |
--------------------------------------------------
| 1  | Chino                | Trousers / Jeans   |
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| 2  | Rainjacket           | Jackets / Coats    |
--------------------------------------------------

查询

SELECT distinct not_categorized.id,  category_lookup
FROM not_categorized
left JOIN title_match ON  not_categorized.category_lookup LIKE CONCAT('%', title_match.title, '%')
group by id;

这给了我正确的结果。基于＆＃34; Chino＆＃34;该类别应该是＆＃34;牛仔裤/裤子＆＃34;。

查询结果

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| id | category         | 
-------------------------
| 1  | Trousers / Jeans |
-------------------------
| 2  | Jackets / Coats  |
-------------------------

我现在如何更新列＆＃34; category1＆＃34;在＆＃34; not_characterized＆＃34;表？

这不起作用：

update not_categorized
set category1 = **QUERY**

Answer 1

查看您的数据，您可以使用基于title和category_lookup

的内部联接

  update not_categorized
  inner join title_match on not_categorized.category_lookup =  title_match.title
  set not_categorized.category1 = title_match.category1

MySQL更新列基于部分查询结果

1 个答案: