How do you combine multiple conditions in a MongoDB query?

Nest conditions inside the $and` and `$or operators, each taking an array of sub-conditions that can be freely combined.

{
  $or: [
    { $and: [
      { day: { $gt: new Date('2000-01-01') } },
      { name: { $ne: 'Bert' } }
    ]},
    { name: { $eq: 'Anna' } }
  ]
}

This selects documents where:

• (date > 2000-01-01 AND name != 'Bert') OR
• (name == 'Anna')