MySQL select 子句中的子查询

Question

SELECT op.*,
(op.total + op.total * 0.21) as price,
(SELECT p.`image` FROM oc_product` p WHERE op.product_id = p.product_id LIMIT 1) AS image
FROM `oc_order_product` op WHERE op.order_id = '80'

我找不到它返回的查询有什么问题。

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'oc_order_productop WHERE op.order_id = '80' LIMIT 0, 25' at line 3

Answer 1

在 oc_product 之前添加一个反引号，所以

SELECT p.`image` FROM oc_product`

应该看起来像

SELECT p.`image` FROM `oc_product`

MySQL select 子句中的子查询

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