這個SQL查詢有什麼問題？

Question

我正嘗試讓車的形式1表，只需一條件，那就是下一個「的車中有比與相同id_user任何順序更新的」

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) 

我只是比較2場（pso.date_add與ps2.date_add）兩者都是日期時間具有相同的結構

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

爲u兩個所述@Siyual和@Sergio「>」是錯誤，則實際我認爲I'm厚爲磚，我可能還得睡更長時間

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 
    ) 

標記**替換爲= =符號