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Query Interface (Retrieving Single Object (find_ (find_by_sql (select_all)…
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order(:attribute).first/last
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batch_size, start, finish, error_on_ignore
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SELECT with Condition
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array : "attributes = ?", array_values
hash : key => attributes, values => value, range, boolean
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sql usage : with specific math operation(e.g sum)
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only : only some condition
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solution(eager loading multiple assocations) : includes
array : multiple associations
hash : nested association
where : specifying condition
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usage : use specific value to controll column statue
count, average, minimum, maximum, sum