Steste2020 :
I need to clean up data in two tables. These are my tables:
Table 1
id | name | visible
48871 | John | 0
9711015| Luke | 1
547574 | Mike | 0
Table 2
id | parent_id | visible
1 | 48871 | 0
2 | 9711015 | 1
3 | 547574 | 0
I would like to update the ids of id (first table) and parent_id (second table) increasingly. So I would like to transform the two tables like this:
Table 1
id | name | visible
1 | John | 0
2 | Luke | 1
3 | Mike | 0
Table 2
id | parent_id | visible
1 | 1 | 0
2 | 2 | 1
3 | 3 | 0
It's possible? What should i use?
Gordon Linoff :
MySQL lets up update multiple tables at the same time. So, you can do:
update table1 t1 join
(select t1.*,
row_number() over (order by t1.id) as new_id
from table1 t1
) tt1
on t1.id = tt1.id left join
table2 t2
on t2.parent_id = t1.id
set t1.id = tt1.new_id,
t2.parent_id = tt1.new_id;