Update sqlite table with non-null values from another table - database

Question

I have two sqlite tables, both with the same column layout. I would like to merge the two tables (or update table 1), taking values from table 2 if they are not null, otherwise, taking them from table 1. Is there a better way of doing this this short of an UPDATE with multiple case clauses (similar to the approach in SQLITE UPDATE field IF NULL from another table)? The tables have a large number of columns which would make such a statement quite long.
table 1
|-------+-------+--------+----+--------|
| id | col1 | col2 | .. | col100 |
|-------+-------+--------+----+--------|
| 2346a | apple | red | | WA |
| d27d7 | pear | green | | VA |
| 568ba | lemon | yellow | | CA |
| 9896f | grape | purple | | CA |
| 1b7da | peach | pink | | CA |
|-------+-------+--------+----+--------|
table 2
|-------+-------+--------+----+--------|
| id | col1 | col2 | .. | col100 |
|-------+-------+--------+----+--------|
| 2346a | null | green | | null |
| 1b7da | null | null | | GA |
| 9896f | plum | null | | null |
|-------+-------+--------+----+--------|
desired result
|-------+-------+--------+----+--------|
| id | col1 | col2 | .. | col100 |
|-------+-------+--------+----+--------|
| 2346a | apple | green | | WA |
| d27d7 | pear | green | | VA |
| 568ba | lemon | yellow | | CA |
| 9896f | plum | purple | | CA |
| 1b7da | peach | pink | | GA |
|-------+-------+--------+----+--------|

Answer 1

You can bring table2 with a left join and prioritize non-null values from table2 using coalesce():
select
t1.id,
coalesce(t2.col1, t1.col1) col1,
coalesce(t2.col2, t1.col2) col2,
...
coalesce(t2.col100, t1.col100) col100
from table1 t1
left join table2 t2 on t2.id = t1.id

Answer 2

You can use ROW VALUES to update Table1:
update Table1
set (col1, col2, col100) = (
select
coalesce(t2.col1, Table1.col1),
coalesce(t2.col2, Table1.col2),
................................
coalesce(t2.col100, Table1.col100)
from Table2 t2
where t2.id = Table1.id
)
where exists (select 1 from Table2 t2 where t2.id = Table1.id);
See the demo.
Results:
| id | col1 | col2 | col100 |
| ----- | ----- | ------ | ------ |
| 2346a | apple | green | WA |
| d27d7 | pear | green | VA |
| 568ba | lemon | yellow | CA |
| 9896f | plum | purple | CA |
| 1b7da | peach | pink | GA |