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> Mirror of <https://developer.salesforce.com/docs/data/data-cloud-query-guide/guide/query-joins.html> (Salesforce, Data 360 Query Guide), read 2026-10-23. Salesforce's own page is the authority; this copy exists because that site refuses non-browser readers.

## Join Records from Different DMOs and DLOs

Data resides in various data lake objects (DLOs) and data model objects (DMOs), which this page refers to as DMOs for consistency. To combine customer data stored in separate DMOs, use a join query. A join uses relationships among DMOs based on keys to match a record in one DMO with a corresponding record in another.

For example, the `ssot__Individual__dlm` DMO contains basic customer information, including first name, last name, and birth date. The customer’s phone number is stored in `ssot__ContactPointPhone__dlm`, the email in `ssot__ContactPointEmail__dlm`, and the address in `ssot__ContactPointAddress__dlm`. To combine this data, use a join query.

*   Inner join: returns only records with matching field values from both DMOs.
*   Full outer join: returns all records from both DMOs. Missing values are `NULL`.
*   Left outer join: returns all records from the left DMO and matching records from the right DMO. Missing values are `NULL`.
*   Right outer join: returns all records from the right DMO and matching records from the left DMO. Missing values are `NULL`.

To retrieve customer email addresses, use an inner join between `ssot__Individual__dlm` and `ssot__ContactPointEmail__dlm`. This retrieves emails by matching Individual records with records in `ssot__ContactPointEmail__dlm` based on `ssot__Id__c` and `KQ_Id__c`. The `KQ_Id__c` is the fully qualified key that ensures the query can accurately identify the difference between the keys.

This table displays sample query results.

| `ssot__Id__c` | `FirstName` | `LastName` | `Email` |
| --- | --- | --- | --- |
| `00QHu00003W7JIDMA3` | `Patricia` | `Feager` | `<name>@<example>` |
| `00QHu00003W7JIRMA3` | `Bill` | `Dadio Jr` | `<name>@<example>` |
| `003Hu00003SELnNIAX` | `Edna` | `Frank` | `<name>@<example>` |

Records with `NULL` key fields don’t match when you join using `=`. Use IS NOT DISTINCT FROM instead. In the example, `KQ_Id__c` uses `IS NOT DISTINCT FROM` because it can be `NULL`. For more information about fully qualified keys, see _Salesforce Help_: [Fully Qualified Keys](https://help.salesforce.com/s/articleView?id=data.c360_a_fully_qualified_keys.htm&language=en_US&type=5).

This query joins `UnifiedIndividual__dlm` and `UnifiedContactPointEmail__dlm`. Unified DMOs lack `KQ_Id__c` because there are no duplicate record IDs.

The query uses aliases. The `AS` keyword is optional.

This example joins the Individual DMO with multiple Commerce DMOs (such as the [_SalesOrder DMO_](https://developer.salesforce.com/docs/atlas.en-us.c360a_api.meta/c360a_api/c360dm_sales_order_dmo.htm)).

To retrieve all records, including non-matching ones, use a full outer join. `NULL` values indicate missing matches.

This query is similar to the first query for the inner join but, it performs an outer join by using the `FULL OUTER JOIN` keyword. It joins the `ssot__ContactPointEmail__dlm` DMO with the `ssot__ContactPointEmail__dlm` DMO based on the Individual ID value and the fully qualified key (`KQ_Id__c`), which are in both DMOs. In addition to the matching records, it also returns the non-matching records from each DMO.

This output shows sample query results, which include matching and non-matching records. The row for Janet Lorre has no email value because this record has no corresponding entry in `ssot__ContactPointEmail__dlm`.

| `ssot__Id__c` | `FirstName` | `LastName` | `Email` |
| --- | --- | --- | --- |
| `003Hu00003SELnCIAX` | `John` | `Bond` | `<name>@<example>` |
| `003Hu00003SELnPIAX` | `Janet` | `Lorre` |  |
| `003Hu00003SELnLIAX` | `Tom` | `Ripley` | `<name>@<example>` |


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