Query strings can be combined using SQL AND and OR operators. To combine query builder functions, see the boolean query.

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Multiple Terms

AND and OR can be used to combine and filter multiple terms. 
SELECT description, rating, category
FROM mock_items
WHERE description @@@ 'keyboard' OR category @@@ 'toy';
If multiple terms are passed into the same query string, they are ORed together by default. 
SELECT description, rating, category
FROM mock_items
WHERE description @@@ 'keyboard headphones';

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Not Term

- omits results that contain a specific term. The following query finds documents that match shoes or running but not white. 
SELECT description, rating, category
FROM mock_items
WHERE description @@@ '(shoes running -white)';