I have a collection with about 200K documents like this:

```
db.place.find()[0]
{
"_id" : ObjectId("5290de1111afb260363aa4a1"),
"name" : "place X",
"center" : [x, y]
}
```

Now I`m trying to query for the places where the center Y is greater than X, and having the following problem:

```
> db.place.find({'center.0':{'$gt':center.1}}).count()
Sat Nov 23 14:42:01.556 JavaScript execution failed: SyntaxError: Unexpected number
```

Any hints?

Thanks in advance

## Best Solution

Because you happen to have exact format of the field every time (circle is a two element array) you can transform it in aggregation framework into two fields and then compare them in a projection, and match to get back just the elements satisfying your requirement of second array element being greater than first array element.

Now, if your array was an arbitrary pair of numerical values, then you can use the above.

You said in comments that your pair represented coordinates (lat, long) - keep in mind that in MongoDB coordinate pairs are always stored as long, lat - if your actual x, y values were coordinates in on a flat (as opposed to spherical) place, you could find all the documents that had Y coordinate greater than X coordinate with a single geospatial query:

The above query assumes that your coordinate system goes from -50 to 50 along X and Y and it finds all points in the triangle that represents all coordinates having Y >= X.