# Count Distinct field query

**URL:** <https://discuss.elastic.co/t/count-distinct-field-query/93661>\
**Category:** Elasticsearch\
**Created:** [July 18, 2017, 8:39pm UTC](https://discuss.elastic.co/t/count-distinct-field-query/93661 "2017-07-18T20:39:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![takcy1980](https://avatars.discourse-cdn.com/v4/letter/t/e47774/32.png) [@takcy1980](https://discuss.elastic.co/u/takcy1980)\
**Post date:** [July 18, 2017, 8:39pm UTC](https://discuss.elastic.co/t/count-distinct-field-query/93661/1 "2017-07-18T20:39:47Z")

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Hi  
I would like to find out how I can do a count distinct on a field where some other field match the condition.  
In SQL I do run the below code and I do get the result I want.

SELECT COUNT(Distinct RevisionNumber)  
FROM `table 1`  
WHERE Week = 1711

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<div class="post-metadata">

**Author:** ![shanec](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shanec/32/4004_2.png) [@shanec](https://discuss.elastic.co/u/shanec)\
**Post date:** [July 18, 2017, 9:30pm UTC](https://discuss.elastic.co/t/count-distinct-field-query/93661/2 "2017-07-18T21:30:30Z")

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What you want is the [cardinality aggregation](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-cardinality-aggregation.html). See [this page](https://www.elastic.co/guide/en/elasticsearch/guide/current/cardinality.html) in our definitive guide for another example

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 15, 2017, 9:30pm UTC](https://discuss.elastic.co/t/count-distinct-field-query/93661/3 "2017-08-15T21:30:36Z")

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