# Elastic pipeline compare two fields condition
**URL:** https://discuss.elastic.co/t/elastic-pipeline-compare-two-fields-condition/283620
**Category:** Elasticsearch
**Created:** [September 8, 2021, 8:00am UTC](https://discuss.elastic.co/t/elastic-pipeline-compare-two-fields-condition/283620 "2021-09-08T08:00:41Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@probson](https://discuss.elastic.co/u/probson)
#### Post date: [September 8, 2021, 8:00am UTC](https://discuss.elastic.co/t/elastic-pipeline-compare-two-fields-condition/283620/1 "2021-09-08T08:00:41Z")
Im trying to create a set condition if two fields are the same, ive not been able to find how to do this with the elastic pipeline
`ctx.dns.question.name =='{{{ctx.host.hostname}}}'`
---
### Author:  [@spinscale](https://discuss.elastic.co/u/spinscale)
#### Post date: [September 13, 2021, 3:17pm UTC](https://discuss.elastic.co/t/elastic-pipeline-compare-two-fields-condition/283620/2 "2021-09-13T15:17:49Z")
Try this
```auto
POST _ingest/pipeline/_simulate
{
"docs": [
{
"_source": {
"a": "c",
"b": "c"
}
},
{
"_source": {
"a": "c",
"b": "d"
}
}
],
"pipeline": {
"processors": [
{
"script": {
"source": "if (ctx.a == ctx.b) { ctx.c = 'SAME'}"
}
}
]
}
}
```
---
### Author:  [@probson](https://discuss.elastic.co/u/probson)
#### Post date: [September 13, 2021, 3:26pm UTC](https://discuss.elastic.co/t/elastic-pipeline-compare-two-fields-condition/283620/3 "2021-09-13T15:26:01Z")
Thats perfect thank you, i dont know why i felt as though it should be different to fieldA == fieldB
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [October 11, 2021, 3:26pm UTC](https://discuss.elastic.co/t/elastic-pipeline-compare-two-fields-condition/283620/4 "2021-10-11T15:26:07Z")
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