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$and

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$and

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

$and performs a logical AND operation on an array of one or more expressions (e.g. <expression1>, <expression2>, etc.) and selects the documents that satisfy all the expressions in the array. The $and operator uses short-circuit evaluation. If the first expression (e.g. <expression1>) evaluates to false, MongoDB will not evaluate the remaining expressions.

Note

MongoDB provides an implicit AND operation when specifying a comma separated list of expressions.

Examples

AND Queries With Multiple Expressions Specifying the Same Field

Consider the following example:

copy 
db.inventory.find( { $and: [ { price: { $ne: 1.99 } }, { price: { $exists: true } } ] } )

This query will select all documents in the inventory collection where:

  • the price field value is not equal to 1.99 and
  • the price field exists.

This query can be also be constructed with an implicit AND operation by combining the operator expressions for the price field. For example, this query can be written as:

copy 
db.inventory.find( { price: { $ne: 1.99, $exists: true } } )

AND Queries With Multiple Expressions Specifying the Same Operator

Consider the following example:

copy 
db.inventory.find( {
    $and: [
        { $or: [ { qty: { $lt : 10 } }, { qty : { $gt: 50 } } ] },
        { $or: [ { sale: true }, { price : { $lt : 5 } } ] }
    ]
} )

This query will select all documents where:

  • the qty field value is less than 20 or greater than 50, and
  • the sale field value is equal to true or the price field value is less than 5.

This query cannot be constructed using an implicit AND operation, because it uses the $or operator more than once.

See also

find(), update(), $ne, $exists, $set.

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