A leading plus sign indicates that this word must be present
in every result returned.
A leading minus sign indicates that this word must not be present
in any result returned.
These two operators are used to change a word's contribution to the relevance
value that is assigned to a result. The < operator decreases the contribution
and the > operator increases it. See the example below. The
relevance of a result only matters if you choose to sort by it.
A leading tilde acts as a negation oeprator, causing the word's contribution to the
row relevance to be negative. It's useful for marking noise words. A row that
contains such a word will be rated lower than others, but will not be excluded
altogether, as it would be with the - operator.
An asterisk is the truncation operator. Unlike the other operators, it should be
appended to the word, not prepended.
The phrase, that is enclosed in double quotes, matches only the results that contain
this phrase literally, as it was typed.
find rows that contain at least one of these words.
... both words.
... word "apple", but rank it higher if it also contains "macintosh".
... word "apple" but not "macintosh".
+apple +(>pie <strudel)
... "apple" and "pie", or "apple" and "strudel" (in any order), but
rank "apple pie" higher than "apple strudel".
... "apple", "apples", "applesauce", and "applet".
... "some words of wisdom", but not "some noise words".