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In addition to the Metamorph searches listed above there is another type
of search based on Metamorph. This will return rows in order of
relevance, with the most relevant record first. LIKER calculates a
relevance based solely on the presence or absence of the terms in the
document. LIKEP uses this same information, but also uses the proximity
of the terms to calculate relevance.
There are several restrictions and points to note about LIKER and LIKEP.
The conditions that must be met to obtain a relevancy search are that a
Metamorph index exists on the field in question. LIKER and LIKEP can
only work with an index. The other condition is that the query must
consist of word terms only. None of the other pattern matchers are
available with LIKER or LIKEP.
The query is a list of terms to be searched for. The words are weighted
by their uniqueness in the document set being searched. This means that
infrequent words are weighted more than common words.
The weight that was calculated for the record is available by selecting
the generated field $rank, which will contain the rank value. The
rank value for LIKER is unscaled. With LIKEP the number will range between
0 and 1000.
For fuller details on using the logic operators in LIKE see
Chapter here
Copyright © Thunderstone Software Last updated: Sun Mar 17 21:14:49 EDT 2013
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