NaN Values in a float field in MSSQL Database

问题

I am working on an old database I inherited from my predecessors.

In it, some float fields contains NaN where there should be a null.

The following SQL doesn't work because it doesn't recognize NaN.

UPDATE xxx SET column= null WHERE column=NaN

How can I do this?

回答1:

Try

UPDATE xxx SET column= null WHERE IsNumeric(column)=0

Then run your select again.

来源：https://stackoverflow.com/questions/450618/nan-values-in-a-float-field-in-mssql-database