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Updating self joined table


Updating self joined table

By : Urwish Patel
Date : November 21 2020, 01:01 AM
With these it helps Ok, if I understand, you want to take each ID in shop 255, find its corresponding id in shop 233, get the parent of that id (in 233), then find the corresponding parent in shop 255, right?
Assuming there are no duplicate names in each shop, this is how I would do it in SQL Server.. probably the same for MySQL:
code :
UPDATE t255
SET parent_id=p255.id
FROM t_category t255
INNER JOIN t_category t233 ON t255.Name=t233.Name AND t233.shop_id=233
INNER JOIN t_category p233 ON p233.id=t233.parent_id
INNER JOIN t_category p255 ON p255.Name=p233.Name
WHERE t255.shop_id=255


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Updating a joined table PHP MySQL

Updating a joined table PHP MySQL


By : user3247291
Date : March 29 2020, 07:55 AM
wish of those help In MySQL I know its possible to select from two tables that have been joined, but is it possible to update the same two tables using a join? Or will I have to update each table individually? , Yes, e.g.
code :
UPDATE table1 t1 
JOIN table2 t2
    ON t2.id = t1.id -- Your keys.
SET t1.column = '...', t2.column = '...' -- Your Updates
WHERE ... -- Your conditional
Updating MySQL Table A based on value from Table B joined via intersection Table C

Updating MySQL Table A based on value from Table B joined via intersection Table C


By : Igor Yuzo
Date : March 29 2020, 07:55 AM
I hope this helps you . You should have on clause with join of writers table and your subquery.
Updating a Database Joined view in only 1 base table

Updating a Database Joined view in only 1 base table


By : Chen
Date : March 29 2020, 07:55 AM
wish help you to fix your issue No, If you want to update or insert via db view that view should be created using only one table. Consider below example, please.
Preparing tables tab and tab2
code :
create table tab
   (
      id int
   )

    create table tab2
   (
      id int
   )
   create view vtab
   as
   select * from tab

   create view vtabboth
   as
   select t.id as tid ,t2.id as t2id from tab t
   join tab2 t2 on t.id = t2.id   
   insert into vtab
   values (1)
   insert into vtabboth
   values (1,1)
Mysql Trigger not updating joined table

Mysql Trigger not updating joined table


By : user1815469
Date : March 29 2020, 07:55 AM
it fixes the issue For some reason this trigger is not updating the Order table, what might I be doing incorrectly?
code :
select orderitemID, SUM(orderitem.UnitPrice) sum_price
from orderitem 
group by orderitemID
select orderID, SUM(orderitem.UnitPrice) sum_price
from orderitem 
group by orderID
CREATE DEFINER = 'root'@'localhost' TRIGGER `orderTotalInsert` 
AFTER INSERT ON `orderitem` FOR EACH ROW 
BEGIN
 UPDATE `Order`
 INNER JOIN (
    SELECT orderID, SUM(orderitem.UnitPrice) sum_price
    FROM orderitem
    WHERE orderID = NEW.orderID
    GROUP BY orderID
 )  t on t.orderID = order.OrderId 
 SET Order.TotalAmmount = t.sum_price;
END
Updating individual table from two joined tables (SQL)

Updating individual table from two joined tables (SQL)


By : Waheeda
Date : March 29 2020, 07:55 AM
it should still fix some issue Your question is a bit unclear. But the general answer is "yes". Here are some mechanisms:
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