Question

首先，我要完成的是：

获取etp_product.price和option_price的总和。

SELECT 
  etp_product.product_id,
  etp_product.price,
  (SELECT MIN(price) AS FIELD_2 FROM etp_product_option_value pov WHERE pov.product_id = etp_product.product_id) AS option_price
FROM
  etp_product
GROUP BY
  etp_product.product_id,
  etp_product.price

我试过这个：

SELECT 
  etp_product.product_id,
  etp_product.price,
  (SELECT MIN(price) AS FIELD_2 FROM etp_product_option_value pov WHERE pov.product_id = etp_product.product_id) AS option_price,
SUM(etp_product.price + option_price) AS Total
FROM
  etp_product
GROUP BY
  etp_product.product_id,
  etp_product.price

但是得到这个错误：

未知栏＆＃39; option_price＆＃39;在＆＃39;字段列表＆＃39;

任何想法如何做到这一点？

Answer 1

SELECT 
  p.product_id,
  p.price,
  IFNULL(MIN(pv.price), 0) as option_price,
  (p.price + IFNULL(MIN(pv.price), 0)) as total
FROM etp_product p
JOIN etp_product_option_value pv ON WHERE pv.product_id = p.product_id
GROUP BY
  p.product_id,
  p.price

Answer 2

SELECT 
etp_product.product_id,
  etp_product.price,
  (SELECT MIN(price) AS FIELD_2 FROM etp_product_option_value pov WHERE pov.product_id = etp_product.product_id) AS option_price,
 etp_product.price + (SELECT MIN(price) AS FIELD_3 FROM etp_product_option_value pov WHERE pov.product_id = etp_product.product_id) AS Total
FROM
  etp_product
GROUP BY
  etp_product.product_id,
  etp_product.price

带有MIN（）的MySQL SUM（）子查询

2 个答案: