这个SQL查询有什么问题？

Question

我正尝试让车的形式1表，只需一条件，那就是下一个“的车中有比与相同id_user任何顺序更新的”

SELECT pso.* 
FROM lafrips_cart pso 
WHERE pso.id_customer > 0 
AND pso.date_add > (SELECT MAX(pso2.date_add) 
FROM lafrips_orders pso2 
WHERE pso2.id_customer < pso.id_customer) 

我只是比较2场（pso.date_add与ps2.date_add）两者都是日期时间具有相同的结构

Answer 1

SELECT pso.* 
FROM lafrips_cart pso 
WHERE 
    pso.id_customer > 0 
    AND pso.date_add > (
     SELECT MAX(pso2.date_add) 
     FROM lafrips_orders pso2 
     WHERE pso2.id_customer = pso.id_customer 
     ) 

Answer 2

为u两个所述@Siyual和@Sergio“>”是错误，则实际我认为I'm厚为砖，我可能还得睡更长时间

SELECT pso.* 
FROM lafrips_cart pso 
WHERE 
pso.id_customer > 0 
AND pso.date_add > (
    SELECT MAX(pso2.date_add) 
    FROM lafrips_orders pso2 
    WHERE pso2.id_customer **=** pso.id_customer 
    ) 

标记**替换为= =符号