Guillermo Gette guillegette
clarkenheim
/ mongodb_distinct_count.js
Last active
December 12, 2023 09:22
MongoDB equivalent of an SQL query to get the distinct values of a field in a collection including the count of documents which have each distinct value (distinct with count)
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| //equivalent of MySQL SELECT COUNT(*) AS cnt, fieldName FROM someTable GROUP BY fieldName; | |
| db.someCollection.aggregate([{"$group" : {_id:"$fieldName", cnt:{$sum:1}}}]); | |
| //as above but ordered by the count descending | |
| //eg: SELECT COUNT(*) AS cnt, fieldName FROM someTable GROUP BY fieldName ORDER BY cnt DESC; | |
| db.someCollection.aggregate([{"$group" : {_id:"$fieldName", cnt:{$sum:1}}}, {$sort:{'cnt':-1}}]); |