SQL updates to table using WINDOW-like function in WHERE clause - sql-update

Question

I have a report that summarizes sales deals by rep, account, deal number, and a flag if they have been contacted by HQ to see if they need additional help. As I extract the data, I can see that some sales reps have multiple deals in progress at the same account.
Here's a sample of the report. In this sample, Sales rep A has been contacted but Sales rep B has never been contacted. We want to fill in the Sales rep A contacted fields while leaving Sales rep B as
opportunity owner | Account | contacted | deal no.
--------------------------------------------------------
Sales rep A | account 1 | Sales rep A | 1
Sales rep A | account 2 | <null> | 2
Sales rep A | account 1 | <null> | 3
Sales rep B | account a | <null> | 1
Sales rep B | account b | <null> | 2
...
I want to update the contacted column with either 'Sales rep A' (or 'YES')
so that it looks like this:
opportunity owner | Account | contacted | deal no.
--------------------------------------------------------
Sales rep A | account 1 | Yes | 1
Sales rep A | account 2 | Yes | 2
Sales rep A | account 1 | Yes | 3
Sales rep B | account a | <null> | 1
Sales rep B | account b | <null> | 2
...
This looks like a case for a window function to me, but maybe a self-join would be better. I tried to work out what the select function would look like
SELECT "opportunity owner", "contacted", "Account", "deal no."
DENSE_RANK () OVER (PARTITION by
--"opportunity owner"
(SELECT "opportunity owner" FROM "test_weekly_top_deal_report" WHERE "worked with this rep before?" LIKE 'Sales rep A')) AS "rank"
FROM "test_weekly_top_deal_report"
WHERE "opportunity owner" LIKE 'Sales rep A'
Which gives me:
opportunity owner | Account | contacted | deal no.
--------------------------------------------------------
Sales rep A | account 1 | Sales rep A | 1
Sales rep A | account 2 | <null> | 2
Sales rep A | account 1 | <null> | 3
But when I modified it to run over all the reps, I used this:
SELECT "opportunity owner", "worked with this rep before?", "account name",
DENSE_RANK () OVER (PARTITION by
--"opportunity owner"
(SELECT "opportunity owner" FROM "test_weekly_top_deal_report" WHERE "worked with this rep before?" NOT LIKE 'NO')) AS "rank"
FROM "test_weekly_top_deal_report"
With just the small change in the WHERE clause now reading "NOT LIKE 'NO' ". That just gave me an error:
The database reported a syntax error: [Amazon](500310) Invalid operation:
Invalid Query: Details: ----------------------------------------------- error:
Invalid Query: code: 8001 context: single-row subquery returns more than one row query: 2151115 location: 0.cpp:8
Suggestions? How do I make this iterate over all the reps and thus fill in the column "contacted"?

Answer 1

select ("opportunity owner" from "test_weekly_top_deal_report"
where "contacted" is "opportunity owner") as X;
select case
when ("opportunity owner" in (X)) and ("contacted" is null or "contacted" is "opportunity owner")
then 'Yes'
else 'No' as contacted
from "test_weekly_top_deal_report"