Drupal how to use a sql case statement alike

Question

I need to update all the nodes in the database based on a certain condition, and I need this update to be conditional. If a certain field is equal to a value, what the modified value will be X If it is otherwise, the value will be y, in a more accurate sense, I need something similar to the case statement in the sql.

Update [node]
Set    [field] = CASE WHEN [field] IN (value1, value2, ...) THEN X ELSE Y END
WHERE  [field] = value

Answer 1

I used the ternary operator to choose between the two values to set and use the set function on the node object