Question

I did

create table tmp select min(xxx_id) from xxx group by y having count(*)>1;

now I need to join this tmp table with another table, but how do I reference the only column in side the tmp table?

select * from table2 s, tmp t where s.xxx_id=t.xxx_id?

clearly won’t work, what should be replacing t.xxx_id?

Answer 1

You need to enclose that column in quotes as:

select * from table2 s, tmp t where s.xxx_id = t.`min(xxx_id)`;

but it’s always better to give alias to columns as it’s not confusing:

create table tmp select min(xxx_id) AS min_xxx_id from xxx group by y having count(*)>1;