How to copy one column of a table into another table's column in PostgreSQL comparing same ID

Question

I need to copy ref_id1 from table1 TO the column ref_id2 in the table2 the two things matching will be : id (same column name), a_ref1 & b_ref1 (column names are differe

Answer 1

UPDATE public.clean_trips_byobu
SET trip_dist = clean_trips.bktp_mt_total
FROM public.clean_trips 
WHERE public.clean_trips.obu_id = clean_trips_byobu.obu_id
AND clean_trips.bktp_trip_id = clean_trips_byobu.trip_id;

Hope it will work for you.

Answer 2

I think this should work:

UPDATE Table2
SET ref_id2 = ref_id1
FROM Table2 
   JOIN Table1 ON 
       Table2.Id = Table1.Id AND Table2.a_ref1 = Table1.b_ref1

Answer 3

UPDATE Table2 --format schema.table_name
SET 
ref_id2 = table1.ref_id1
FROM table1 -- mention schema name
WHERE table1.id = table2.id
AND 
table1.a_ref1 = table2.b_ref1;

Answer 4

What you want is

UPDATE Table2
SET ref_id2 = table1.ref_id1
FROM table1
WHERE table1.id = table2.id
AND table1.a_ref1 = table2.b_ref1;

Edit This is what you actually want

As seen here (crudely)