Update column with specific values ( if clause) - sql

Question

I am trying to insert new values into specific column with "update table set specific column...."
I have two tables like this:
Table1
Name Idnumber Score
JOHN DB 10
JOHN IT NULL
KAL DB 9
HENRY KK 7
KAL DB 10
HENRY IP 9
ALI IG 10
ALI PA 9
Table2
NAME | MONEY |
-----------------|
JOHN | |
-----------------|
KAL | |
-----------------|
HENRY | |
-----------------|
ALI | |
-----------------
And I want that my table look like this:
Updated Table
NAME | MONEY |
-----------------|
JOHN | |
-----------------|
KAL | yes |
-----------------|
HENRY | half |
-----------------|
ALI | yes |
-----------------
The condition for writing "yes" into money column is that all scores under same name in table1 should be 9 or higher, the condition for writing "half" is that scores should be no lower than 6 ( what I mean is that scores might be 10,9,8,7 and 6)
So basically it means, that, for example, Henry cannot be selected and I cannot write "yes" next to his name in updated table, because he has score under the value of 9 in one line , but in the other he has the score of 7.(null values also should be emitted).
I'm using a sas program. Thank you!!!

Answer 1

You seem to be treated NULL as a value that is less than "9". In standard SQL (which works in both MySQL and SAS, the original tags) is:
update table2 t2
set money = 'YES'
where not exists (select 1
from table1 t1
where t1.name = t2.name and coalesce(t1.score, 0) < 9
);
If you want to guarantee that there is at least one row in table2, one method is aggregation:
update table2 t2
set money = 'YES'
where (select (case when sum(case when t1.score > 9 then 1 else 0 end) = count(*)
then count(*)
end)
from table1 t1
where t1.name = t2.name
) > 0

Answer 2

You could try the following syntax:
update table2
set money = 'YES'
where not exists (select 1 from table1 t1 where t1.name = table2.name and t1.score < 9)
However this would also update records that have no match in table1. In MySQL, one simple option to avoid that uses a join:
update table2 t2
inner join (select name, min(score) min_score from table1 group by name) t1
on t1.name = t.name and t1.min_score >= 9
set t2.money = 'YES'