Pupeno wrote:
What I don't like about that, is that half the person_id fields would be empty- and conversely, I don't like the idea of column that can join to either of two tables depending on the value of a switch (the type column) :-)
and half the group_id fields would be empty. I was thinking about:
SONG-TO-PERSON-OR-GROUP LINK TABLE
* song_id
* musician_id
* type ('person', 'group')
* role (performer, lyricist, etc.)
But this is the solution that has so many redundant data. It's not very clear, but it's there.
- perhaps using separate columns in the link for each role might work... performer_group_id, performer_person_id, lyricist_person_id, etc. There will be one row per recording of a song, although some columns on that row may be empty.
- ian
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