SQL 如何更新具有“空白”值的列
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How to update a column with a "blank" value
提问by Avinash
How do I update a column value (varchar(20), not null) with a "blank" value?
如何varchar(20), not null使用“空白”值更新列值 ( )？
回答by Louis
If you want to update it with NULLyou will need to change it to allow NULL. Otherwise update with an empty string "".
如果要更新它，NULL则需要将其更改为 allow NULL。否则用空字符串更新""。
回答by Nanda
Update TableName Set ColumnName='' where [Condtion] // To update column with an enpty values
回答by Mitul Panchal
If there have any int column which you may want to do null
如果有任何 int 列您可能想要做 null
Update TABLE_NAME set name = '',id = cast(NULLIF(id,'') as NVARCHAR)
Update TABLE_NAME set name = '',id = cast(NULLIF(id,'') as NVARCHAR)
