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replacing null values
The quiz question: Finish the following statement to replace NULL values with the value of "Cross-Platform".
UPDATE games SET platform = "Cross-Platform" WHERE id ... (1,4);
My Question: Replacing the 3 dots with "in" is accepted as the correct answer. Does that however not change platform to "Cross-Platform" independent of current entries being empty (Null)? This statement will simply update id 1 and 4 if I understand it correctly.
Steven Parker218,691 Points
You are exactly right, but the current table is shown in the example and you can clearly see that the items with id's 1 and 4 have "NULL" for the platform. So those are indeed the items that need to be updated.
If you were writing a query from scratch, you'd naturally want to test the current value in the WHERE clause; but the quiz question wanted to see if you could get the job done within the constrains given.