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Posted to user-zh@flink.apache.org by naisili Yuan <yu...@gmail.com> on 2020/06/30 01:31:23 UTC

flink sql能否显示地创造一列null行

由于union的操作，结果集的列数必须一致，我能否加入这一列，语法如下：
UNION
SELECT NULL
,
aaa,
bbb,
NULL
FROM （）