I have to query for total amount of a column using an aggregate function. The column data type is NVARCHAR(MAX). How can I convert it to Integer?
I have tried this:
SELECT SUM(CAST(amount AS INT)),
branch
FROM tblproducts
WHERE id = 4
GROUP BY branch
...but I'm getting:
Conversion failed when converting the nvarchar value '3600.00' to data type int.
3600.00 is not integer so CAST via float first
sum(CAST(CAST(amount AS float) AS INT))
Edit:
Why float?
除了gbn的答案,你还需要防范非数字案例:
sum(CASE WHEN ISNUMERIC(Amount)=1 THEN CAST(CAST(amount AS float) AS INT)END )
SELECT sum(Try_Parse(amount as Int Using 'en-US')), branch FROM tblproducts
WHERE id = 4 GROUP BY branch
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