mysql在where语句中查询错误

Question

我试图在我的代码中使用它之前在phpmyadmin中使我的查询正确并且我得到以下错误，虽然我知道列存在

Error
SQL query:


UPDATE 
tendesig_zink_dev.euid0_hikashop_product 
SET 
tendesig_zink_dev.euid0_hikashop_product.product_quantity = tendesig_zink_production.euid0_hikashop_product.product_quantity
WHERE 
tendesig_zink_dev.euid0_hikashop_product.product_id = tendesig_zink_production.euid0_hikashop_product.product_id

MySQL said: Documentation

#1054 - Unknown column 'tendesig_zink_production.euid0_hikashop_product.product_id' in 'where clause' 

Answer 1

您收到未知列错误的原因是您的查询不知道表tendesig_zink_production.euid0_hikashop_product。尝试使用此查询

UPDATE 
tendesig_zink_dev.euid0_hikashop_product, tendesig_zink_production.euid0_hikashop_product
SET 
tendesig_zink_dev.euid0_hikashop_product.product_quantity = tendesig_zink_production.euid0_hikashop_product.product_quantity
WHERE 
tendesig_zink_dev.euid0_hikashop_product.product_id = tendesig_zink_production.euid0_hikashop_product.product_id