Error converting data type nvarchar to numeric.

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i am using the following query to convert the data type of a column from nvarchar to numeric.

SQL

alter table emp.dbo.grimage alter column nags numeric

but when I run the command i got the following error :-

Error converting data type nvarchar to numeric.
The statement has been terminated.

Posted 7-Dec-12 19:41pm

ashwani.pandita

Updated 7-Dec-12 19:52pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 8-Dec-12 1:51am

Do you have data in your table ? Or is it blank ?

Patel Shailendra 9-Dec-12 0:02am

ALTER TABLE tableName
ALTER COLUMN Column_Name numeic (in your case)

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2012-12-07T20:03:00

The problem is when you try to alter the table column, the DataBase Engine try to convert all the data present in that column to the new datatype.

So, unless the data present in that table against that column is numeric, it will throw exception that "Error converting...".

So, you have to
1. delete all the data present in that column (for the rows which don't have data of numeric datatype), then
2. alter the column and
3. insert data again with numeric values.

Thanks...