5. Complex queries
DEFINITION:
A complex query is a parameter query that searches using more than one parameter value i.e. on two or more criteria.
AND Query
It might be an AND query. The example below shows that the query is searching for event = birthday AND paid = yes
OR Query
It might be searching using two parameters for event = lunch OR event = birthday
NOT Query
The parameters might be looking for all events except for birthday.
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