MQL reference navigationCommandsAggregationDiagnosticQuery And WriteOperatorsAccumulatorsAggregationArithmetic ExpressionArray ExpressionArray QueryArray UpdateBitwiseBitwise QueryBitwise UpdateComparison QueryConditional ExpressionData SizeDate ExpressionElement QueryEvaluation QueryField UpdateGeospatialLiteral ExpressionLogical QueryMiscellaneousMiscellaneous QueryObject ExpressionProjection$metaSet ExpressionTimestamp ExpressionVariable ExpressionWindow OperatorsReference/Operators/ProjectionMongoDB Query Language (MQL) Projection OperatorsProjection operators are used to select and transform fields in documents.$metaThe $meta operator returns a calculated metadata column with returned dataset.
Reference/Operators/ProjectionMongoDB Query Language (MQL) Projection OperatorsProjection operators are used to select and transform fields in documents.$metaThe $meta operator returns a calculated metadata column with returned dataset.