Question

SELECT 
   table_1.id, 
   (SELECT SUM(amount) FROM table_2 WHERE table_1.id = table_2.bid) AS sum_total 
FROM table_1 
WHERE table_1.total!=0

I need to update table_1.total so that it would equal with sum_total.

Any adivce?

Answer 1

Try below:

update table_1 as t1 left join (select SUM(amount) as totalamount ,id FROM table_1 group by id) as t2 on t1.id =t2.id 
 set  t1.total=t2.totalamount 

Please do needful changes.