Lets build SQL query which will return the resultset where length_cm >= 50cm:
Stepof6
Double-click on a table which will be used in your SQL query.
Check fields which will be used in SQL query.
Set condition parameters.
You can drag field name from fields list.
Press OK button, and your SQL query will be built.
Your SQL query is ready to run.
Press F9, and SQL query will be executed.