Xano's Data Builder is a super handy toolkit for creating, managing, and tweaking data. It lets you build an API without writing a single line of code, handle complex queries, link databases, and connect to external APIs.

First things first, log in to your Xano account. If you don't have one yet, no worries, you can sign up easily.

Once you're in, you'll land on the dashboard. Look to the left sidebar and click on "Data Builder" to get to the tool.

In the Data Builder, you can either start fresh with a new table or pick an existing one. To create a new table, hit 'Add Table,' fill in the details like table name and description, and then click 'Create table.'

After creating or selecting a table, it's time to define your data structure. This means setting up fields and choosing the field type for each one.

Click on the 'Queries' tab, right next to 'Structure'. Queries let you manipulate the data in your table. You'll see predefined queries like create, get, update, and delete. You can also whip up custom queries.

To make a complex query, click 'Add Query' and choose 'Create Custom Query.' A dialog box will pop up with options to build your query. You can pick the table, operation, criteria, sort, fields, and calculations.

Once your query is ready, you can test it right in the Data Builder. Click 'Test This Endpoint' for the query you just made. This will check if everything's working as it should.

If the query works perfectly, go ahead and save it. Give it a good name so you can easily find and use it later.

Following these steps will help you run complex queries using Xano's Data Builder. Take some time to practice and explore all the features to get a better hang of it.