UPDATE如果column不为null,如果为null则保留为null

Question

我有以下SQL:

UPDATE TableA
SET first_name = 'AAA',
    last_name = 'BBB',
    address1 = '123',
    address2 = 'Fake St.,',
    phone = '1234567',
    id = '11223344'

如果每列不为空,我应该使用什么才能更新？

Answer 1

update tableA
set first_name = case when first_name is null then null else 'aaa' end,
last_name = case when last_name is null then null else 'bbb' end,
...