How to count number of elements with AQL?

问题

I need to count elements that was in result of SQL query: db._query('FOR v in visitors FILTER v.ip == "127.0.0.1" return COUNT(v.guid) ')

This request is return my a length of every GUID, but I need to get total number of GUIDs for example: 2.

回答1:

You need to use the result of the query as input for the COUNT function, and then RETURN this result.

You can replace the RETURN value of the actual query by 1 for performance reasons:

RETURN COUNT(FOR v IN visitors FILTER v.ip == "127.0.0.1" RETURN 1)

来源：https://stackoverflow.com/questions/37077048/how-to-count-number-of-elements-with-aql