联接三个SQL表？

Question

I have a working SQL query, but I need to grab another piece of data from a third table in the query for ease of use, but have been unable to grab it.

Every table is basically tied together by tenant_id

(I apologize for the bad structure, I didn't create the DB)

TABLE: tenant_statements

tenant_id balance property date

TABLE: leases

lease_id tenant_id property unit_number

TABLE: tenants

tenant_id first_name last_name global_comment

My current query:

SELECT * 
FROM tenant_statements t
INNER JOIN (
SELECT * 
FROM leases
GROUP BY tenant_id
ORDER BY lease_id
)l ON t.tenant_id = l.tenant_id
WHERE t.date = '$date'
AND t.property = '$property'
ORDER BY t.balance DESC

This give's me the appropriate response for joining the two tables: leases and tenant_statements . $date and $property are set via a PHP variable loop and used for presentation.

What I am attempting to do is also grab tenants.global_comment and have it added each result.

the ideal output will be:

tenant_statements t: t.balance, t.date

leases l: l.property, l.unit_number

tenants x: x.first_name, x.last_name, x.global_comment

All in one query.

Can anyone point me in to the right direction? Thank you!

Answer 1

How about something like

SELECT * 
FROM    tenant_statements t INNER JOIN 
        (
            SELECT * 
            FROM leases
            GROUP BY tenant_id
            ORDER BY lease_id
        )l ON t.tenant_id = l.tenant_id INNER JOIN
        tenants ts  ON  t.tenant_id = ts.tenant_id
WHERE   t.date = '$date'
AND     t.property = '$property'
ORDER BY    t.balance DESC

Answer 2

Although each join specification joins only two tables, FROM clauses can contain multiple join specifications. This allows many tables to be joined for a single query.

 SELECT  t.tenant_id,
t.balance,
l.unit_number,
l.property
x.first_name, x.last_name, x.global_comment


fROM  tenant_statements t
   INNER JOIN  leases l ON l.tenant_id = t .tenant_id
   INNER JOIN tenants x  on x.tenant_id = t.tenant_id