The Rel Forum

I've installed v3.011 since I reported this bug and the related one concerning TUPLE{...}. The TUPLE bug seems to have been fixed, but not this one. Here's the example you asked for:


Hugh

Now I find I can't recreate the problem either. Sorry.

Hugh

Please ignore previous post. I didn't read carefully enough.

Hugh

Sorry for stupidly giving the wrong screenshot. Try this:



Hugh

This is really an issue with our inheritance model (IM) and thus only indirectly an issue with TTM (because TTM says that if inheritance is supported, then it must be via our IM). Spencer's example contravenes the IM precisely because B is not a proper subtype of A (see IM Prescription 5a). Thus CON...

Sorry for the delay. I forgot to chase this one.

I see your point about a blank row at the top. Yes, fixing that bug would be fine for me. Thanks.

Hugh

Having discovered the problem with displaying a tuple with RVAs that I've just reported, I tried enclosing the TUPLE expression in REL{...}. I also suppressed attribute types in the column heads. In each case the attribute type is REL{n INTEGER} but instead of it not showing at all it appeared as ju...

The screenshot below shows Rel's display of the result of a TUPLE expression for a 3-tuple whose attribute values are all relations. This time the missing stuff did not magically reappear when I saved as html.

Hugh

Here's a strange one (in Windows 10). Sometimes my input from the lower pane in command mode doesn't appear above the result in the upper pane. However, when I save the upper pane as html, it does then appear in the html file! Below are a couple of screenshots illustrating this phenomenon. Hugh Inpu...

Thanks, Dave.

I've since found that when the edit functions are greyed out in command mode, if I go back to Rel mode and close all listings, then return to command mode, the edit functions reappear. But even then they don't always work when I choose copy on a selection in the output pane.

Hugh

This might be another Windows 10 problem you can't reproduce. Sometimes when I want use copy-and-paste, e.g., from query results, command lines, or view definitions in the Rel interface, all the edit functions are greyed out. Sometimes they seem to magically reappear available when I've done nothing...

Just to confirm: I was re-running the query.

Hugh

Thanks, Dave. I've done what you suggested.

Hugh

Perhaps a fairly obvious wibni that you already have in plan for a future update (pose V3.010): I have an all-key relvar of degree five. When entering data it is quite common for four of the attributes to have the same value in several tuples. To able to use copy-and-paste across one or more consecu...

I love the recent improvements to the "Rel" interface but here's a tiny wish. When editing a base relvar, any chance of having the blank row for entering a new tuple at the top rather than the bottom? It would save me from having to scroll to the bottom every time, and I have to use the sc...