mongodb aggregate count
#return the number of documents whose "field" field has a value of A
query = db.collection.aggregate([{
"$match": {
"field": "A"
}
},{
"$count": "number of occurrences"
}])mongodb aggregate count
#return the number of documents whose "field" field has a value of A
query = db.collection.aggregate([{
"$match": {
"field": "A"
}
},{
"$count": "number of occurrences"
}])mongodb aggregate group
#equivalent of the following SQL instruction:
# SELECT COUNT(*) FROM Table
# GROUP BY your_field
query = db.collection.aggregate([
{
"$group": {
"_id": "$your_field", #GROUP BY your_field
"total": {"$sum":1} #COUNT(*)
}
}
])Copyright © 2021 Codeinu
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