>Hi All,
>I didn't know this and while I'm sure everyone else did *s*, I'm going to post it anyway.
>
>VFP throws an error when you attempt to index on a memo field. Error 34 - Operation is invalid for a Memo, General, or Picture field. But if you wrap the memo field in a text manipulation function (e.g. alltrim(), upper()), it allows it.
>
>Someone posted some code about indexing on a memo field and I sent back saying you can't do that. They sent back saying I already do this, here it is and why does it work.
>
>Any ideas?

The function returns a string, not an explicit memo, so it's indexable. Look at the difference between TYPE('mMemoField') and TYPE('UPPER(mMemoField)'). BTW, this is one of those cases where VARTYPE() and TYPE() are not interchangable, because a field is involved.

Other problems related to maximum key length may arise from using a memo field as an index source; if the longest memo field content is over 240 chars, the index operation will fail during index creation...and there are all sorts of consequences - the length of the key is established at the time of tag creation, which can cause mis-sortation for memo fields whose data content length exceeds the initial longest memo field's length and creation will fail if all the memo fields are empty.