EXPLAIN is documented in the manual
<http://dev.mysql.com/doc/refman/4.1/en/explain.html>.
So it is, but it doesn't show me the decisions it makes. It shows me
whether it will use an index or not, it won't show me how it puts the
whole thing together.
Compare to the postgres one:
http://www.designmagick.com/article/23/page/5
(yes I did write that article so I am biased)
which tells me what's going on at each step of the decision process.
Whether you find that useful or not - *shrug* - I however find it very
useful and wish the mysql explain was as good as that.
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