Hi there Everyone! I am very new to access so please explain me detailed the solution if you can help.
I have the following problem:
There is one field which contains many types of data (blank, numeric, string). I would like to make very simple query which deletes all the rows which are non-numeric. How can I do that? Please help me if you can! Thank you in advance!

Try

DELETE *
FROM TableName
WHERE Not IsNumeric(FieldName)

Thank you so much! This is what I wanted!

And what command will delete those rows where the given field is blank?

If they're Null:

WHERE IsNull(FieldName)

or if they may also contain a zero length string:

WHERE Nz(FieldName, "") = ""