Question

I need to write a query that will return results if all the tables I’m asking for exist. I know this exists:

show tables like 'user'

Just not sure how to extend that for multiple tables. I know this is invalid code, but something like

show tables like 'user' AND show tables like 'site' AND ...

Thank you!

Answer 1

select * 
from information_schema.tables
where table_name in ('tb1','tb2','tb3') 
and table_schema = 'your_db'
having count(table_name) = 3

Mmm, I realised there was a problem with that query. It returns just one record if all the tables exist. This would be a better solution

select group_concat(table_name order by table_name) as table_list
from information_schema.tables
where table_name in ('tb1','tb2','tb3') 
and table_schema = 'your_db'
having count(*) = 3