How to determine the sum for a table row?

Given

I have two tables similar to following example:

Table1

Table2

Expected

I need to get the total sum for each row of Table1 based on the sum of the values from Table2.

For example, the first row of Table1 becomes added the sum 14.
Because first (1) + second (4) + third (5) + fourth (4) = 14

Resulting table:

How can I get the sum for each of those table rows by SQL ?

Join to Table2 four separate times:

SELECT t1.*, t2_1.Sum + t2_2.Sum + t2_3.Sum + t2_4.Sum As Sum
FROM Table1 t1
INNER JOIN Table2 t2_1 ON t2_1.ID = t1.ID1
INNER JOIN Table2 t2_2 ON t2_2.ID = t1.ID2
INNER JOIN Table2 t2_3 ON t2_3.ID = t1.ID3
INNER JOIN Table2 t2_4 ON t2_4.ID = t1.ID4

You could join Table2 with the condition being that ID is in one of the Table1 IDs. Then using group by and sum get your desired output:

SELECT t1.*, SUM(t2.Sum) AS Sum 
FROM Table1 t1 
JOIN Table2 t2 ON
    t2.ID IN (t1.ID1, t1.ID2, t1.ID3, t1.ID4) 
GROUP BY t1.ID1, t1.ID2, t1.ID3, t1.ID4;