从另一行同一个表更新表行

Question

table image with columns and rows here

你好，我想用language_code = ro来更新所有行与使用language_code = en（只有name，meta_description，short_description，description和head_title）的行一样，我试过了

UPDATE lc_products_info lc LEFT JOIN lc_products_info lc2 ON (lc.product_id=lc2.product_id AND lc.name='' AND lc2.language_code='en') SET lc.name = lc2.name;

但它似乎删除了leanguage code = en的行内容，如果有人可以帮助我....提前感谢

Answer 1

使用Where：

UPDATE lc_products_info lc
LEFT JOIN lc_products_info lc2 ON lc.product_id=lc2.product_id AND lc2.language_code='en' SET lc.name = lc2.name
WHERE lc.name=''
AND lc.language_code='ro';

Answer 2

UPDATE lc SET name=lc2.name FROM lc_products_info lc LEFT JOIN lc_products_info lc2 ON lc.product_id=lc2.product_id AND lc.name='' AND lc2.language_code='en'