This commit is contained in:
Franco Colmenarez 2021-09-15 13:30:34 -05:00
parent 728b881ac1
commit e3c43a68f7

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@ -330,3 +330,69 @@ Returns:
{ "_id" : "Charmander", "total" : 20 }
```
[More SQL vs Mongo examples](https://docs.mongodb.com/manual/reference/sql-aggregation-comparison/)
# Indexes for faster searching
Get indexes of a collection:
```
> db.pokemons.getIndexes()
```
It will return `_id` because it's the index by default
```
[{
"v" : 2,
"key" : {
"_id" : 1
},
"name" : "_id_"
}]
```
## Create an index
Create type text index
```
> db.pokemons.createIndex({name: "text"})
```
Will return
```
{
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"createdCollectionAutomatically" : false,
"ok" : 1
}
```
And now we will get more indexes:
```
> db.pokemons.getIndexes()
[
{
"v" : 2,
"key" : {
"_id" : 1
},
"name" : "_id_"
},
{
"v" : 2,
"key" : {
"_fts" : "text",
"_ftsx" : 1
},
"name" : "name_text",
"weights" : {
"name" : 1
},
"default_language" : "english",
"language_override" : "language",
"textIndexVersion" : 3
}
]
```
## Searching by text
```
> db.pokemons.find({$text: {$search: "Pikachu"}})
{ "_id" : ObjectId("61422737f096f662d9ea826d"), "name" : "Charmander", "level" : 20, "pokedexId" : 2, "type" : [ "fire" ] }
```