When I run this command with `SUM()` SELECT COUNT(*) AS [Records], SUM(t.Amount) AS [Total] FROM dbo.t1 AS t WHERE t.Id > 0 AND t.Id < 101; I'm getting, Arithmetic overflow error converting expression to data type int. Any idea on what is the cause of it? I'm just following the instructions in [this answer](https://dba.stackexchange.com/a/174093/2639).

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For values larger than the `INT` max (2,147,483,647), you'll want to use [COUNT_BIG][1](*). SELECT COUNT_BIG(*) AS [Records], SUM(t.Amount) AS [Total] FROM dbo.t1 AS t WHERE t.Id > 0 AND t.Id < 101; If it's happening in the `SUM`, you need to convert `Amount` to a `BIGINT`. SELECT COUNT(*) AS [Records], SUM(CONVERT(BIGINT, t.Amount)) AS [Total] FROM dbo.t1 AS t WHERE t.Id > 0 AND t.Id < 101; [1]: https://docs.microsoft.com/en-us/sql/t-sql/functions/count-big-transact-sql