I have these two tables, and that what I want is to compare them to know if there is any null value in table 2, if there is, replace the existing value in table 1 by the null value in table 2 (by the code column that is the primary key).
Table 1
Code Name Points
1 Juan Perez 10
2 Marco Salgado 5
3 Carlos Soto 9
4 Alberto Ruiz 12
5 Alejandro Castro 5
10 Jonatan Polanco 0
11 JD NULL
Table 2
Code Name Points
1 Juan Perez 10
2 Marco Salgado 5
3 Carlos Soto 9
4 Alberto Ruiz 12
5 Alejandro Castro 5
10 Null 0
11 JD 9
The resulting table should look like this
Table 2
Code Name Points
1 Juan Perez 10
2 Marco Salgado 5
3 Carlos Soto 9
4 Alberto Ruiz 12
5 Alejandro Castro 5
10 Jonatan Polanco 0
11 JD 9