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MongoDB Interview Preparation

Solution: Using Logical Operators

The topic discusses the use of logical operators in MongoDB queries, specifically the $and and $or operators, which allow for complex filtering of documents. The $and operator requires all specified conditions to be true, while the $or operator matches documents that satisfy at least one of the conditions. Additionally, it covers the use of comparison operators like $gt for numeric filtering and the .sort() method for ordering results, along with the .limit() method to control the number of returned documents. These tools enable the creation of precise and powerful queries.

We'll cover the following...
Query
db.orders.find({
  $and: [
    { $or: [{ status: "Pending" }, { status: "Processing" }] },
    { total: { $gt: 500 } }
  ]
}).sort({ orderDate: -1 }).limit(3)

The explanation of the query is given below:

  • Line 1: This begins a query (a read operation) that will search documents in orders matching the filter object provided between the ...