# Get difference between 2 string arrays
**URL:** https://discuss.elastic.co/t/get-difference-between-2-string-arrays/96283
**Category:** Elasticsearch
**Created:** [August 8, 2017, 2:09pm UTC](https://discuss.elastic.co/t/get-difference-between-2-string-arrays/96283 "2017-08-08T14:09:49Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@olegb](https://discuss.elastic.co/u/olegb)
#### Post date: [August 8, 2017, 2:09pm UTC](https://discuss.elastic.co/t/get-difference-between-2-string-arrays/96283/1 "2017-08-08T14:09:49Z")
Hi All,
I've a documents contains an array fields names "my\_tag" and "unique\_id". I'd like to get differences between 2 unique\_ids with values like { "uid":1, my\_tag: ["va1","val2", "val10"]} and { "uid":2, my\_tag: ["va1","val20"]} with result
udi:1 diff uid:2 = ["val2", "val10"]
and
udi:2 diff uid:1 = ["val20"]
like set type in python
what is the way to do the difference
Thaks
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [September 5, 2017, 2:12pm UTC](https://discuss.elastic.co/t/get-difference-between-2-string-arrays/96283/2 "2017-09-05T14:12:46Z")
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