Using Query Builder in the Oracle 10g Express Edition - Creating a SELECT query with a WHERE clause (Page 4 of 5 )
Employees hail from different cities. You could find all those from, say, "Seattle" by imposing a condition. The following qualified Select will show just that. You qualify your Select by typing in the condition '='Seattle' in the Condition part of the GUI as shown.

Now the window in the SQL tab will show the following content:

The Result tab will show the following window.

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