Jul 25, 2016

$and operator in MongoDB

$and: This operator works same as AND in SQL Server. $and operator uses to perform logical operation on two or more than two arrays and its select the documents that satisfy to all expression.

Syntax:


{ $and: [ { <expression1> }, { <expression2> }, ... , { <expressionN> } ] }


Example: Suppose we have a collection “Order” and want to select those records which quantity is 2 and price is 200. See following collection.


{ "_id" : 1, "item" : "item1", "qty" : 1, "Price" : 500 }
{ "_id" : 2, "item" : "item1", "qty" : 2, "Price" : 200 }
{ "_id" : 3, "item" : "item1", "qty" : 4, "Price" : 300 }
{ "_id" : 4, "item" : "item1", "qty" : 8, "Price" : 700 }
{ "_id" : 5, "item" : "item1", "qty" : 2, "Price" : 500 }


Run the following query to get expected result described above.


db.Order.find({$and:[{qty:2},{Price:200}]})


Result:


{ "_id" : 2, "item" : "item1", "qty" : 2, "Price" : 200 }