Which of the following tools in Alteryx is used to join two or more data sets based on a common key?

The tool in Alteryx that is used to join two or more data sets based on a common key is the "Join" tool. Here are the steps to use it:

1. First, you need to identify the common key in both datasets. This key will be used to match the records from both datasets.

2. Drag and drop the "Join" tool from the "Join" category onto the canvas.

3. Connect the input data streams to the Join tool. The first dataset should be connected to the left input anchor (L) and the second dataset to the right input anchor (R).

4. In the configuration window of the Join tool, select the common key field(s) in both datasets under the "Join Fields" section.

5. You can also specify the type of join you want to perform (Inner, Left, Right, or Outer) under the "Join Type" section.

6. Once you've configured the Join tool, run the workflow. The joined dataset will be outputted from the "J" output anchor of the Join tool.

Remember, the Join tool in Alteryx is case sensitive, so ensure that the common key in both datasets have the same case.