mysql - 挂起mysql查询

Question

我对以下查询有疑问

select
ord.order_id, 
ordProduct.product_id,
coupProd.product_id,
coup.date_end as DateEnd, coup.coupon_id
from `order` ord
inner join order_product ordProduct on ord.order_id = ordProduct.order_id
inner join coupon_product coupProd on ordProduct.product_id = coupProd.product_id
inner join coupon coup on coupProd.coupon_id = coup.coupon_id
where (coup.date_end > curdate());

如果我删除 where 子句，查询将正常执行，否则它就会挂起。有什么想法吗？

Answer 1

这本身不是解决方案，但作为一种解决方法，您可以将其作为嵌套查询来完成。即，

SELECT * FROM (
    SELECT
    ord.order_id, 
    ordProduct.product_id,
    coupProd.product_id,
    coup.date_end AS DateEnd, coup.coupon_id
    FROM `order` ord
    INNER JOIN order_product ordProduct ON ord.order_id = ordProduct.order_id
    INNER JOIN coupon_product coupProd ON ordProduct.product_id = coupProd.product_id
    INNER JOIN coupon coup ON coupProd.coupon_id = coup.coupon_id)
WHERE (DateEnd > CURDATE());