Before you begin, it's important to know the shape and structure of the event you're trying to query, especially if this is your first time using this feature.
Luckily, we can create a query for that:
[
{
"$sort":{"date":-1}
},
{
"$limit":"#n#"
}
]
Start by exiting the playground back to the default query view, and creating a new query called 'Last N events' (or whatever you like, really), by clicking the + button.
Next, copy the code above into the Params section. This will be the body of your query, and all your logic should go in here.
This is an aggregate query, which should be reflected in the Type drop down section. This will place a wrapper around the query when it's ran. A find option is available also.
Note the 'limit' value:
"$limit":"#n#"
The two hash symbols enclose a value that needs to be passed in by the user. Here, it is the value n.
This is a fairly simple query, and probably won't get you too far in terms of displaying graphs.
Our Query Examples and Tips section will go more in to detail on different query types and how to display the data you wish to see.
Next up, we'll show you how you can test your queries and analyse their output, using the Query Playground.