Question

我有两个更新查询，我想从中制作一个，但我无法弄清楚如何？我已经在Stack Overflow上查看了其他一些示例，但我无法让它工作。

你能帮助我吗？

查询1：

更新exercise_list SET ex1 = ex2，ex2 = ex3，ex4 = NULL WHERE day_ID = 1 AND user_ID = 4

查询2：

更新training_results SET ex1 = ex2，ex2 = ex3，ex4 = NULL WHERE day_ID = 1 AND user_ID = 4

更新：感谢所有的发型！我已经接受了第一个芒果

Answer 1

有两种方法可以实现这一目标：

使用单个mySqlQuery调用，只需按以下方式调用mySqlQuery函数：

mySqlQuery(UPDATE exercise_list SET ex1= ex2, ex2= ex3,ex4 = NULL WHERE  
day_ID= 1 AND user_ID= 4;   
UPDATE training_results SET ex1= ex2, ex2= ex3,ex4 = NULL WHERE  
day_ID= 1 AND user_ID= 4;)

方法2：

UPDATE exercise_list e_l ,training_results t_r SET  
e_l.ex1=e_l.ex2, e_l.ex2=e_l.ex3,e_l.ex4=NULL,  
t_r.ex1=t_r.ex2, t_r.ex2=t_r.ex3,t_r.ex4=NULL  
WHERE e_l.day_ID = 1 AND e_l.user_ID = 4 AND  
t_r.day_ID = 1 AND t_r.user_ID = 4;

希望它有所帮助。

Answer 2

可以是两个表的内连接

UPDATE exercise_list as a 
INNER JOIN training_results as b ON (a.day_ID = b.day_ID   AND a.user_ID = b.user_ID )
SET ex1= ex2, 
    ex2= ex3,
    ex4 = NULL
WHERE a.user_ID=4
AND a.day_ID = 1

Answer 3

UPDATE A 
SET A.ex1 = A.ex2
, B.ex1 = B.ex2
, A.ex2 = A.ex3
, B.ex2 = B.ex3
, A.ex4 = NULL
, B.ex4 = NULL
FROM exercise_list A
JOIN training results B on  A.ID = B.ID
WHERE A.day_id = 1 and A.user_id = 4

Answer 4

可能这个：

UPDATE exercise_list as el, training_results as tr SET  
el.ex1=el.ex2,el.ex2=el.ex3, el.ex4=NULL, tr.ex1=tr.ex2, tr.ex2=tr.ex3, tr.ex4=NULL  
WHERE el.day_ID = 1 AND el.user_ID = 4 AND tr.day_ID = 1 AND tr.user_ID = 4;

sql make 2 update queries 1

4 个答案: