Query builder is your quick reference guide to SQL syntax. It not only lets you use its own SQLs, but also provides you with the option to add your own along with editing the existing ones.

Query builder is available both in SQLA and Teradata Studio Express. Express query builder is more interactive and has drag-and-drop features. Let's first cover SQLA, followed by Studio Express.

Here is how you can proceed with query builder in SQLA:

1. Query builder in SQLA is under the Help tab, or you can press F2. Here, you can click on any existing command or browse for the one you need. 
2. You can also add frequently used queries in query builder. Click on + as shown in the following screenshot and add the queries that you need most, so that you don't have to search for them: 

Here is how to proceed with query builder in Express:

1. In express, you can edit an existing query using the query builder. Selecting the query in the SQL Editor, right-click and select the Edit in Query Builder option:
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2. Once you click on the Edit option, your query will be opened in a new window with many other options. Here, you can add new tables to the existing query, creating a relationship between them. There is also a tab that gives you options to put conditions (where, or, and) in queries. You can also add the group by clause; refer to the screenshot for details:

There is an option to change the statement type when you click on the statement box.