使用来自select的值进行Mysql更新

Question

我有两个查询。第一个将返回多行：

SELECT parent_entry_id,child_entry_id FROM exp_playa_relationships WHERE parent_field_id = '34'; 

......我想使用的值（parent_entry_id，child_entry_id）并将其纳入该查询，替换“X”和“Y”，也为了每一行由第一个查询返回。

UPDATE exp_channel_data AS t1, 
(
SELECT field_id_46,field_id_47 FROM exp_channel_data WHERE entry_id = 'x') AS t2 
SET t1.field_id_60 = t2.field_id_46, t1.field_id_61 = t2.field_id_47 
WHERE t1.entry_id = 'y'; 

我想我需要使用另一个JOIN，但我无法弄清楚如何在我的示例中实现一个JOIN。任何帮助将非常感激。

Answer 1

谢谢大家的回复。工作语法是：

UPDATE exp_channel_data AS t1, 
(
SELECT 
entry_id as ei2, child_entry_id, parent_entry_id, field_id_46 as f46,field_id_47 as f47 
FROM 
exp_channel_data JOIN exp_playa_relationships ON entry_id=child_entry_id AND parent_field_id = 34) AS t2 
SET t1.field_id_60 = f46, t1.field_id_61 = f47 
WHERE t1.entry_id=parent_entry_id; 

Answer 2

尝试此查询

UPDATE exp_channel_data a1 INNER JOIN exp_playa_relationships a ON a1.entry_id = a.child_entry_id 
INNER JOIN exp_channel_data b ON a.parent_entry_id = b.entri_id 
SET a1.field_id_60 = b.field_id_46, ta1.field_id_61 = b.field_id_47 
WHERE parent_field_id = '34' 

Answer 3

我觉得这是你追求的：

UPDATE exp_playa_relationships AS t0 
    JOIN exp_channel_data  AS t1 
    ON t1.entry_id = t0.child_entry_id 
    JOIN exp_channel_data  AS t2 
    ON t2.entry_id = t0.parent_entry_id 
    SET t1.field_id_60 = t2.field_id_46 
    , t1.field_id_61 = t2.field_id_47 

Answer 4

还是在一个比较经典的语法，你需要调整你自己的富&栏属性，但使用类似如下：

update exp_channel_data t1 
set (t1.field_id_60,t1.field_id_61) = (
    select t2.field_id_46 , t2.field_id_47 
    from exp_channel_data t2 
    where 1=1 
     and t2.entry_id = 'x' 
     and /* ENTER YOUR t1-t2 join condition here */ 
) 
where 1=1 
    and t1.entry_id = y 
; 

但是既然你是MySQL我不相信它支持ts复合子查询。因此：

update exp_channel_data t1 
set t1.field_id_60 = (
    select t2.field_id_46 
    from exp_channel_data t2 
    where 1=1 
     and t2.entry_id = 'x' 
     and /* ENTER YOUR t1-t2 join condition here */ 
) , t1.field_id_61 = (
    select t3.field_id_47 
    from exp_channel_data t3 
    where 1=1 
     and t3.entry_id = 'x' 
     and /* ENTER YOUR t1-t3 join condition here */ 
) 
where 1=1 
    and t1.entry_id = y 
;