age

Question

我有一个 stats 桌

name | age | sound
------------------
 m   | 5   |   a
 a   | 3   |   c
 c   | 5   |   d
 f   | 1   |   j
 d   | 6   |   r
 c   | 55  |   d

我添加了一列名为 appearance

ALTER TABLE stats
    ADD appearance INTEGER DEFAULT case
                         when age > 4 then 'red'
                         when name = f then 'blue'

        end

并得到一个这样的表。

name | age | sound | appearance
--------------------------------
 m   | 5   |   a   |   red
 a   | 3   |   c   |   <null>
 c   | 5   |   d   |   red
 f   | 1   |   j   |   blue
 d   | 6   |   r   |   red
 c   | 55  |   d   |   red

然后，我想再增加一列，叫做 flavor

ALTER TABLE stats
    ADD flavor varchar(20) case
                    WHEN appearance = 'red' THEN 'apple'
                    WHEN appearance = 'blue' THEN 'blueberry'
    END

但我一直收到错误信息。

[Vertica][VJDBC](7344) ROLLBACK: default expressions may not refer to other columns with default expressions

如何从我创建的第一列创建第二列？