如何基于另一个表中的值设置一个表的字段

Question

I have two tables. The first contains a list of ID's. The second has a larger list of ID's. I want to update the second table ONLY if it doesn't exist in the first. This isn't catching all of them:

UPDATE TableB
LEFT OUTER JOIN TableA
ON TableB.id = TableA.id
SET TableB.Status = "Inactive"
WHERE TableB.id IS NULL;

Answer 1

You are close, assuming that TableB is the "second" table:

UPDATE TableB b LEFT OUTER JOIN
       TableA a
       ON b.id = a.id
    SET b.Status = 'Inactive'
WHERE a.id IS NULL;
------^

Your WHERE clause referenced the wrong table.