mysql : loop over tables and alter table add index

Question

I have ~1000 tables that start with the same prefix : table_prefix_{SOME_ID} (i can take the ids from another table)

what is the fast way to loop over

Answer 1

Forget looping. Just do this:

select concat( 'alter table ', a.table_name, ' add index `fields` (`field`);' )
from information_schema.tables a 
where a.table_name like 'table_prefix_%';

Then take the result set and run it as a SQL script.

BTW, you probably mean create index index_name on table_name( column_name);