Updating a column based off records from two tables matching?

Question

We're using SQL Server 2016. I have two tables, DEAD and QUETABLE . However, QUETABLE also has a column called DEAD . This is going to sound confusing, but I'll try to make it make sense. What I need to do, is set the column ( DEAD ) in QUETABLE to the value YES if the column WEBSITE in QUETABLE matches the same named column WEBSITE in the table DEAD .

(The DEAD table is just filled with dead websites, QUETABLE might have some that are dead, marking it will let us know)

In a magical world, something like this would work:

UPDATE QUETABLE 
SET [DEAD] = 'YES' 
WHERE
    SELECT de.website, de.[city], de.[state], de.[zip], de.[new-ind], de.phone
    FROM [QUETABLE] de
    WHERE EXISTS (SELECT website, company, zip
                  FROM dead d2
                  WHERE d2.website = de.website OR d2.state = de.state OR d2.zip = de.zip)

But obviously that can't happen, and I can't really figure out how to do this.

Answer 1

I think you simply want:

UPDATE de
    SET [DEAD] = 'YES'
FROM [QUETABLE] de
WHERE EXISTS (SELECT website, company, zip
              FROM dead d2
              WHERE d2.website = de.website OR d2.state = de.state OR d2.zip = de.zip
             );