[MongoDB] Remove, update, create document

Remove:

Remove the wand with the from our name "Doom Bringer" wands collection.

Db.wands.remove ({name: "Doom bringer"})>> writeresult ({' ngremoved ': 1})

When we removed "Doom Bringer" the wand, we noticed that it had a power "Death" of, and we don ' t want any wands as that in our data Base. To is safe, let's remove any wands containing the in their powers .

Db.wands.remove ({name: "Doom bringer", Powers: "Death"})

Update:

Write the command to update the wand with a in and set the to name "Devotion Shift" price 5.99 .

Db.wands.update ({name: "Devotion Shift"},{"$set": {price:5.99}});

Update all the document: "multi"

Increase level_required by 2, apply to all of the documents match {powers: "Fire"}:

db.wands.update (  "Fire"},  {"$inc": {level_required:2}},  {true })

Create New Document If there is no existing one: "upsert"

db.logs.update (  "Dream Bender"},  {"$inc": {count:1}},  {True })

[MongoDB] Remove, update, create document