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Advanced queries support the following operators:
+ 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.
And here are some examples:
apple banana
find rows that contain at least one of these words.
+apple +juice
... both words.
+apple macintosh
... word "apple", but rank it higher if it also contains "macintosh".
+apple -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"
... "some words of wisdom", but not "some noise words".

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