如何在MYSQL的FROM子句中指定更新目标表？

Question

我的剧本 - :

UPDATE catalog_product_price 
SET catalog_product_price.value = 200
WHERE value_id = (
    SELECT value_id
    FROM catalog_product_price
    WHERE `entity_id` = ( 
        SELECT `entity_id` 
        FROM `catalog_product_entity` 
        WHERE `sku` LIKE 'sample'
        ) 
    AND website_id = 10
    AND customer_group_id= (
        SELECT customer_group_id
        FROM customer_group
        WHERE 
            customer_group_id = catalog_product_price.customer_group_id 
            AND customer_group_code =100
        )
    )

它给了我以下错误 - :

#1093 - 您无法在FROM子句中为更新指定目标表'catalog_product_price'

任何人都可以为我提供与我在此链接上尝试的解决方案相同的解决方案 - :http: //www.mysqlfaqs.net/mysql-faqs/Errors/1093-You-can-not-specify-target-table-comments- for-update-in-FROM-clause 但无法做...请帮帮我..

Answer 1

您需要将表连接到UPDATE语句,而不是使用所有这些子查询

UPDATE  catalog_product_price cpp

JOIN    catalog_product_entity cpe
  ON    cpe.entity_id = cpp.entity_id
  AND   cpe.sku LIKE 'sample'
  AND   website_id = 10

JOIN    customer_group cg
  ON    cg.customer_group_id = cpp.customer_group_id
  AND   cg.customer_group_code = 100

SET cpp.value = 200

注意:你的语法很难阅读,所以我可能在解释它时犯了错误.无论如何,这是一个想法,它应该帮助你得到最终的答案.