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並前往https://javarevisited.blogspot.com/2015/10/how-to-replace-null-with-empty-string-in-SQL-SERVER-isnull-collesce-example.html

How to replace NULL with Empty String in SQL Server ...

Similarly, COALESCE(column, '') will also return blank if the column is NULL. ... is the standard way and supported by all major databases like MySQL, ...

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