如何处理 NULL 在 T-SQL 查询中显示 0

Question

当结果为 Null 时，如何更改下面的 SQL 语句以显示 0 而不是 Null？

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

Answer 1

这应该可行：

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