将两个选择语句合并/组合成一个

Question

I've got the following MySQL statement that has a couple of select statements of which one does a select for all the results returned by another select. Just wondering if it can be combined into one by any chance. Eg. Like a triple join.

select networks.name as network_name, installations.name as installation_name
from network_installations

join installations on installations.id = network_installations.installation_id

join networks on networks.id = network_installations.network_id

where network_installations.network_id in (
    select network_installations.network_id
    from network_installations 
    where network_installations.installation_id = 1
);

Note. I've done sql queries but this is my first experience with sql joins.

Answer 1

Use aliases for table network_installations:

select networks.name as network_name, installations.name as installation_name
from network_installations ni1
join installations on installations.id = ni1.installation_id
join networks on networks.id = ni1.network_id
join network_installations ni2 on ni2.network_id = ni1.network_id
where ni2.installation_id = 1