Visual Query Builder
Introduction
If you are not an SQL guru and you have to compose database queries, the Visual Query Builder may be the right tool for you. The Visual Query Builder opens inside layouts, is saved inside the model file, and can be reopened from the Data Tools menu.
How to Start the Query Editor
Start the Query Editor by clicking the table header. Alternatively, start an empty editor and drag & drop a table from the layout. Alternatively, start an empty editor and drag & drop a table from the layout.
Join Further Tables to the Query
You may join further tables to the query using foreign keys or virtual foreign keys. Virtual foreign keys can be created by column drag & drop in the layout and are saved to the model file.
Add further tables to the layout by clicking the small arrow icon near columns. Clicking the label on the foreign key line, you can switch to different join types: INNER JOIN, LEFT JOIN, EXISTS.
Choose the Columns to Select
Choose the columns to select by ticking the column checkboxes.
Filter the Data
Data can be filtered by right-clicking any of the columns and choosing the 'Filter' option.
Use Group By
Select the toggle button in the query builder menu to make the query use the GROUP BY clause. Then you can make use of aggregate functions by right-clicking any of the columns and choose Aggregate: MIN, MAX, SUM, AVG...
Save Result to File
Similar to the SQL Editor, the result from the Result Pane can be saved to the file.