如何处理NULL以在T-SQL查询中显示0

Question

当Null为结果时，如何将下面的SQL语句更改为显示0而不是Null？

SELECT cast (sum([ColumnA]) as DECIMAL(18,0)) AS [Weight] 
FROM [DB1].[dbo].[Tabel1]

Answer 1

这应该有效：

SELECT cast(COALESCE(sum([ColumnA]), 0) as DECIMAL(18,0)) AS [Weight] 
FROM [DB1].[dbo].[Tabel1]