postgresql 更改列类型并设置非空
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时间:2020-09-11 00:09:38 来源:igfitidea点击:
Change column type and set not null
提问by Oto Shavadze
How do you change the column type and also set that column to not null
together?
您如何更改列类型并将该列设置not null
在一起?
I am trying:
我在尝试:
ALTER TABLE mytable ALTER COLUMN col TYPE character varying(15) SET NOT NULL
This returns an error.
这将返回一个错误。
What is the right syntax?
什么是正确的语法?
回答by Federico Razzoli
This should be correct:
这应该是正确的:
ALTER TABLE mytable
ALTER COLUMN col TYPE character varying(15),
ALTER COLUMN col SET NOT NULL