Hi!
Eli wrote:
Hi,
Is it possible, or probably will be possible, to define indexes spanned
on more than one table?
Short answer: AFAIK, it isn't, and it probably will never be.
I mean that if I have column col_a from table tbl_A, and col_b from
table tbl_B.. Can I define a KEY with both those columns? Where will the
index be saved?
It seems you got a misconception about the purpose(s) of an index:
1) It is used to speed up searches, to allow direct access avoiding scans.
2) It is a means to support integrity constraints ("unique", "foreign
key", ...).
For neither of these I see a reason to have values of more than one
table in an index.
If you see it different, please describe.
Jörg
--
Joerg Bruehe, Senior Production Engineer
MySQL AB, www.mysql.com
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