Mongodb The value of a document is stored in an array. How to push new data to the array when updating?

  mongodb, question
 name: 'kad',
 tags: ['mongodb', 'database', 'NoSQL'],

I now have new data’ mysql’ to be added to the array corresponding to tags. How can I push it in?

Db.col.update ({'name':' kad'}, {$ set: {'tags':' MySQL'}}}) is it not equivalent to overwriting the original data

I want the result to betags:['mongodb','database','NoSQL','mysql']

Please refer to

db.col.update({name : "kad"}, { $push : { tags : "mysql"}})

Please also refer to official documents: …

Suggestion: Read MongoDB documents more; MongoDB’s documentation is of high quality.