Question

这是我的查询

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UPDATE 
    `product_pricing` 

SET `formula_id`= '2'

WHERE 1

如何将SELECT查询与更新查询合并？

我只需要更新具有SELECT product_pricing.id, product_pricing.formula_id, product_pricing.vat_calculated, products_ids.id, products_ids.link_id, product_attributes.fty_id, product_attributes.size_id, product_sizes.size_id, product_sizes.wheel FROM product_pricing LEFT JOIN products_ids ON product_pricing.id = products_ids.id LEFT JOIN product_attributes ON products_ids.link_id = product_attributes.fty_id LEFT JOIN product_sizes ON product_attributes.size_id = product_sizes.size_id WHERE product_sizes.wheel = '13'的产品，但是要获取此信息，我需要一些左联接。

Answer 1

您可以将此更新与LEFT JOIN和Where一起使用

update product_pricing 
LEFT JOIN products_ids ON product_pricing.id = products_ids.id
LEFT JOIN product_attributes ON products_ids.link_id = product_attributes.fty_id
LEFT JOIN product_sizes ON product_attributes.size_id = product_sizes.size_id
SET product_pricing.formula_id= '2'
WHERE

product_sizes.wheel = '13'

Answer 2

尝试

update product_pricing p
LEFT JOIN products_ids pi ON p.id = pi.id
LEFT JOIN product_attributes pa ON pi.link_id = pa.fty_id
LEFT JOIN product_sizes ps ON pa.size_id = ps.size_id
SET p.formula_id= '2'
WHERE
ps.wheel = '13'

Answer 3

我认为这里需要INNER JOIN：

update product_pricing 
INNER JOIN products_ids ON product_pricing.id = products_ids.id
INNER JOIN product_attributes ON products_ids.link_id = product_attributes.fty_id
INNER JOIN product_sizes ON product_attributes.size_id = product_sizes.size_id
SET product_pricing.formula_id= '2'
WHERE product_sizes.wheel = '13'

使用左联接的MySQL更新

3 个答案: