Insert in one table selecting form another base on condition - sql

Question

Consider following relationship.
I am trying to add new row in Tenants from NewRentPayments if no Tenants's tuple found in NewRentPayments base on composite primary keys houseid and apartmentnumber.
Have a look in my query you will have better idea
insert into Tenants(houseid, apartmentnumber, leasetenantssn, leasestartdate, leaseexpirationdate, rent, lastrentpaiddate, rentoverdue)
(
select n.* from NewRentPayments as n left join Tenants as t
on
t.houseid = n.houseid
and
t.apartmentnumber = n.apartmentnumber
where
t.houseid is null
or
t.apartmentnumber is null
) as newval
(newval.houseid, newval.apartmentnumber, newval.leasetenantssn, now(), NULL, newval.rent, newval.datepaid, 'f');
It is giving error on as newval.
ERROR: syntax error at or near "as"
LINE 12: ) as newval
^
********** Error **********
ERROR: syntax error at or near "as"
SQL state: 42601
Character: 345
Note: This is not a simple insert value in one table from another table as done here. In my case I am inserting some constants/custom values too into the Tenants rows while inserting NewRentPayments tuples.
I am using Postgresql.

Answer 1

You need to put the values as you want to insert in a select.
Try this:
insert into Tenants (houseid, apartmentnumber, leasetenantssn, leasestartdate, leaseexpirationdate, rent, lastrentpaiddate, rentoverdue)
select newval.houseid, newval.apartmentnumber, newval.leasetenantssn, now(), null, newval.rent, newval.datepaid, 'f'
from (
select n.*
from NewRentPayments as n
left join Tenants as t on t.houseid = n.houseid
and t.apartmentnumber = n.apartmentnumber
where t.houseid is null
or t.apartmentnumber is null
) as newval;