Query DynamoDB with different PK values

Question

I am trying to use a [query](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/dynamodb/client/query.html) with `KeyConditionExpression` in `Boto3` to query a DynamoDB table. I am trying to return all the records using the following sudo expression

```
(PK=X AND SK=Y) OR (PK=A AND SK=B)
```
OR

```
KeyConditionExpression=((Key("PK").eq(f"USERID#{user_id}") & Key("SK").eq(f"PROJECTID#{project_id}")) | (Key("PK").eq(f"USERID#{user_id}PROJECTID#{project_id}") & Key("SK").begins_with("LAYERID#")))
```

PK is the primary key and SK is the Sort Key. Does this need to be 2 separate queries and the results join or can it be done in one?

Accepted Answer

You must specify a single value of the partition key in each Query request. So yes - in this case, you can make both Query calls in parallel, and then merge the result set on the application side.

Query DynamoDB with different PK values

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