Find, MongoDB. A real estate database might have a price for each house. We want to find just properties that have a field within a range of values (like a certain price).
With special range queries, used with the find() method, we can find documents with fields in a certain range. The $lt and $gt terms are useful here.
A program. Here we have a real estate database with 3 houses in it. Each house has a different price. We use find() to get matching houses with prices less than, or greater than, a value.
Detail We use the string "$lt" in a nested dictionary argument to find a range of prices less than a value.
Detail The "$gt" operator works the same way as less than, but means greater than.
However For large amounts of data, this because impossible. Using MongoDB to query for ranges (with lt and gt) is faster.
A review. Find() can be used with ranges. A dictionary argument with a special term (lt or gt) enables a range query. For large databases, this is essential.
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Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.