SQL更新

Question

我有以下SQL DML更新命令，但語法isn't正確，命令doesn't工作：

UPDATE hmsg_vehicle_category 
SET hmsg_vehicle_category.hmsg_id, hmsg_vehicle_category.vehiclecategories_inputname 
SELECT l_p.hmsg_id, tmp_p_vc.inputname 
FROM hmsg_him_product AS l_p INNER JOIN ( SELECT p.id, vc.inputname 
              FROM him_product p INNER JOIN vehicle_category vc 
               ON p.id = vc.product 
              ORDER BY p.id, vc.inputname DESC) AS tmp_p_vc 
    ON l_p.products_id = tmp_p_vc.id 
WHERE l_p.hmsg_id = 171; 

哪有我執行這個SQL命令？ snytax中的錯誤在哪裏？

感謝您的幫助！

格爾茨 Marwief

Answer 1

喜歡的東西：

update hmsg_vehicle_category set 
    hmsg_id = l_p.hmsg_id, 
    vehiclecategories_inputname = tmp_p_vc.inputname 
from hmsg_him_product as l_p 
    inner join him_product as p on p.id = l_p.products_id 
    inner join vehicle_category as vc on vc.product = p.id 
where l_p.hmsg_id = 171 

被警告，這一次將在hmsg_vehicle_category更新表中的所有記錄。可能要添加到where條款如下：

update hmsg_vehicle_category as hvc set 
    vehiclecategories_inputname = tmp_p_vc.inputname 
from hmsg_him_product as l_p 
    inner join him_product as p on p.id = l_p.products_id 
    inner join vehicle_category as vc on vc.product = p.id 
where 
    l_p.hmsg_id = 171 and hvc.hmsg_id = 171 

但我不能勸告，此刻更具體的東西，因爲它是從你的問題不清楚。