Hello, I am learning MySQL and have a question. I know about the importance
of the PRIMARY KEY statement, but I also see a KEY statement being used
when creating a table. Is this just short for PRIMARY KEY, or what's the
difference?
Second question, when I have a large table, but with only 2 small cells per
row (2 columns), is it useful to create a PRIMARY KEY, KEY, or INDEX for
speed (there is no set relation to another table).
Third question, when exactly does MySQL use indexes. Is it used when the
indexed column is part of a (SELECT *) WHERE statement, together with a
non-indexed column? I just want to check if matching a row is present or
not, not actually retrieve information ("WHERE ip='$ip' and date>curdate()")
Thanks, Marco
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| Marco Bleeker, Amsterdam
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