The $having Parameter

The $having parameter allows you to filter your results of an aggregation using boolean operators, similar to the HAVING clause in SQL. For example, to aggregate our earthquakes and get only the sources with more than 20,000 quakes:$select=source, count(*) as count&$group=source&$having=count > 20000

Multiple boolean operators are available to combine filters:

Operator Description Example
AND The logical and of two expressions. a AND b will return true ONLY if a and b are both true.
OR The logical or of two expressions. a or b will return true if either a or b are true.
NOT The logical not of an expression. NOT a will return true, ONLY if a is false.
IS NULL Whether a value is null or not. a IS NULL will return true, ONLY if a is null.
IS NOT NULL Whether a values is not null. a IS NOT NULL will return true, ONLY if a is not null
( ... ) Parentheses are used for defining order of operations. b>3 AND (a=1 OR a=2)