When you open a query, Query Builder displays it in the Query window, split into two panels:
Depending on your preferences, the panels may be split vertically or horizontally.
Each table is displayed in a box containing the name of the table and the names of columns in that table. There are a number of icons that help identify the current database object. The icons indicate whether descriptive comments are attached, the type of datasource, the column's datatype, and whether indexes have been defined for tables in the query.
Lines are drawn to indicate the relationships between columns. Relationships are set up between tables to identify how a column in one table relates to a column in another table.
A check mark to the left of the column name indicates the column has been included in the query. This means that Query Builder will search for data corresponding to the column name when you run the query. No check mark indicates that column's data will not be included.