Check out example codes for "update with inner join postgres". It will help you in understanding the concepts better.

Code Example 1

UPDATE T1, T2,
[INNER JOIN | LEFT JOIN] T1 ON T1.C1 = T2. C1
SET T1.C2 = T2.C2, 
    T2.C3 = expr
WHERE condition

Code Example 2

update xtable x 
set col1 = y.col1
from ytable y 
where y.x_id = x.id;

Code Example 3

select *
from tableA a join
     tableB b
     on a.id like '%' + b.id + '%';

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