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[kegobeer]

The error:

Can't create/write to file '/tmp/#sql_45d5_0.MYI'

The problem:

MySQL can't create a temporary file for the result set in the given temporary directory.

The solution:

Alter the tmpdir variable to point to a writable directory.  It requires changing the tmpdir line in the my.cnf file, usually in the [mysqld] section (tmpdir = /writable/dir, where /writable/dir is a directory to which you can write).

Ask your webhost to make the above changes.