# Using hail\_concordance
**URL:** https://discuss.hail.is/t/using-hail-concordance/2450
**Category:** Hail Query & hailctl
**Created:** [January 28, 2022, 8:28pm UTC](https://discuss.hail.is/t/using-hail-concordance/2450 "2022-01-28T20:28:20Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@genome](https://discuss.hail.is/u/genome)
#### Post date: [January 28, 2022, 8:28pm UTC](https://discuss.hail.is/t/using-hail-concordance/2450/1 "2022-01-28T20:28:20Z")
Hello! I am trying to compare two datasets with exactly the same samples. I have used the code:
`summary, samples, variants = hl.concordance(dataset, dataset2)`
However, I am having some trouble understanding the output. I am trying to extract the variants that are unique to each dataset, can I get some advice on how to do this?
---
### Author:  [@tpoterba](https://discuss.hail.is/u/tpoterba)
#### Post date: [January 28, 2022, 8:32pm UTC](https://discuss.hail.is/t/using-hail-concordance/2450/2 "2022-01-28T20:32:58Z")
The output of `concordance` is really most useful for interrogating genotype concordance, rather than variant concordance. It’s easy to use other table-level methods to query the variants unique to each table.
```python
# only need variant information, not genotypes
ds1 = dataset.rows()
ds2 = dataset2.rows()
# unique in dataset1 -- filter out any variants in ds2
ds1_unique = ds1.anti_join_rows(ds2)
# unique in dataset2 -- filter out any variants in ds1
ds2_unique = ds2.anti_join_rows(ds1)
```
---
### Author:  [@genome](https://discuss.hail.is/u/genome)
#### Post date: [January 28, 2022, 8:38pm UTC](https://discuss.hail.is/t/using-hail-concordance/2450/3 "2022-01-28T20:38:43Z")
> [@tpoterba](#):
>
> ```python
> # only need variant information, not genotypes
> ds1 = dataset.rows()
> ds2 = dataset2.rows()
>
> # unique in dataset1 -- filter out any variants in ds2
> ds1_unique = ds1.anti_join_rows(ds2)
>
> # unique in dataset2 -- filter out any variants in ds1
> ds2_unique = ds2.anti_join_rows(ds1)
>
> ```
Thank you! I seem to be getting this error unfortunately:
```python
AttributeError: Table instance has no field, method, or property 'anti_join_rows'
Did you mean:
Table method: 'anti_join'
```
---
### Author:  [@genome](https://discuss.hail.is/u/genome)
#### Post date: [January 28, 2022, 8:39pm UTC](https://discuss.hail.is/t/using-hail-concordance/2450/4 "2022-01-28T20:39:13Z")
I will try “anti-join”
---
### Author:  [@tpoterba](https://discuss.hail.is/u/tpoterba)
#### Post date: [January 28, 2022, 8:39pm UTC](https://discuss.hail.is/t/using-hail-concordance/2450/5 "2022-01-28T20:39:45Z")
oh, oops, that’s right.