Postgres UPDATE using SELECT whit INNER JOIN multiple tables - sql

Question

I am just starting with Postgres and I find myself with the following Query made in Postgres, which seeks to bring me data from 4 different tables.
SELECT
table1.id,
table2.icon,
table3.title,
table4.description
FROM
table1
JOIN table5 ON id_t5 = id_t3
JOIN table3 ON id_t1 = id_t3
AND id_t3 = 816
LEFT JOIN table2 ON table5.id_t2_fk = table2.id_t2
LEFT JOIN table4 ON table4.id_t3_fk = table1.id_t1;
My problem is that I have to make an UPDATEof these 4 tables after generating the Query.
I can not think of how to solve the problem, since the UPDATE syntax of Postgres is different from that of MySQL or SQLserver.
I tried to do this:
UPDATE
table1
INNER JOIN table5 ON id_t5 = id_t3
INNER JOIN table3 ON id_t1 = id_t3
LEFT JOIN table2 ON table5.id_t2_fk = table2.id_t2
LEFT JOIN table4 ON table4.id_t3_fk = table1.id_t1
SET
table2.icon = "new icon",
table3.title = "new title",
table4.description = "new description"
WHERE
table1.id_t1= 816;

Answer 1

Postgres allows you to do updates in CTEs. Perhaps this does what you want:
with data as (
select t1.id, t2.id_t2, t2.icon, t3.id_t3, t3.title,
t4.id_t4, t4.description
from table1 t1 join
table5 t5
on id_t5 = id_t3 join
table3
on id_t1 = id_t3 and id_t3 = 816 left join
table2 t2
on t5.id_t2_fk = t2.id_t2 left join
table4 t4
on t4.id_t3_fk = t1.id_t1
where t1.id_t1= 816
),
u2 as (
update table2
set icon = 'new icon'
where t2.id_t3 in (select data.id_t2 from data)
returning *
),
u3 as (
update table3
set title = 'new title'
where id_t3 in (select data.id_t3 from data)
returning *
)
update table4
set description = 'new description'
where id_t4 in (select data.id_t4 from data);
If not, something similar will.