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Nested queries help you to use the result of one query as an input parameter of another, and the queries executed in a nested query works in a transactional manner. Follow the steps given below to add a nested query to a data service.

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Let's create a data service using the Create Data Service wizard:

1. Open a terminal, navigate to the <EI_HOME>/bin directory, and start Start the WSO2 ESB profile.

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   Linux/Mac./integrator.shWindowsintegrator.bat --run

   borderColor #542989 bgColor #ffffff borderWidth 1

   Localtabgroup Localtab active true title On MacOS/Linux/CentOS Open a terminal and execute the following command: Code Block wso2ei-6.3.0-integrator Localtab title On Windows Go to Start Menu -> Programs -> WSO2 -> Enterprise Integrator 6.3.0 Integrator. This will open a terminal and start the ESB profile.

2. Open the ESB profile's Management Console using https://localhost:9443/carbon, and log in using admin as the username and the password.
3. Click Create under Data Service.

4. Enter the following name for the data service

   Data Service Name	EmployeesDataService

5. Click Next to enter the datasource thedatasource connection details.

Connecting to the datasource

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