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Concordance gives you a visual cue to indicate how records are sorted, by means of a small up/down arrow embedded in the column name. When a database is opened such that no sort order is applied, the arrow doesn t appear in any column name. Clicking a column name sorts only on the contents of that column. To create a composite sort of two or more columns, you can click the Sort button located on the button bar at the top of Concordance s screen. This opens the Database Sort tool. Available fields appear in a list on the left. You can add fields by highlighting them, then clicking the Ascending or Descending buttons. Sort order may be mixed so that, in the composite sort, the first field sorts ascending and a second field sorts descending. To remove a field, highlight the desired field and click the Remove button.

1. We consider the feature we re about to add in isolation and add to the design only those things that are strictly required for the feature. 2. We look at the next few features we expect to add to this area of the application (or think we might add, if the plan isn t that clear yet) and ask how easy they would be to implement given the design we just came up with. a. If the answer is that we d have to rewrite everything, we go back to the drawing board entirely. b. If we don t have to rewrite everything, we decide whether it s worth going back to step 1 or if that amount of refactoring will be acceptable at that point. c. If there isn t any refactoring required in our guessing about the next feature after this one, or the quantity is acceptable, we move on to step 3. 3. We start sketching out the implementation. While we re building/modifying the two or three classes that will form the core of the feature, we tend to do so without writing tests as yet. This is because we ll look over the design as we go and often find that in doing so, we need to go back to an earlier stage briefly and change the way the code is coupled together. However, even before you get as far as writing the first line of code, you should be thinking about how you will test the code. This helps shake out tight couplings that shouldn t be there, and it forms a rough test plan by the time you have code that compiles, which helps with the next stage.

The query in Listing 4-36 shows all employees who are younger than employee 7876. The subquery will never return more than one row, because EMPNO is the primary key of the EMPLOYEES table.

Once you ve selected the desired fields and their respective sort orders, clicking the Sort button sorts records (see Figure 8-13). A progress bar appears at the bottom of the Sort tool to indicate the status of an ongoing sort.

In case there is no employee with the employee number specified, you get the no rows selected message. You might expect an error message like single row subquery returns no rows (actually, this error message once existed in Oracle, many releases ago), but apparently there is no problem. See Listing 4-37 for an example. Listing 4-37. When the Subquery Returns No Rows select ename, init, bdate from employees where bdate > (select bdate from employees where empno = 99999); no rows selected The subquery (returning no rows, or producing an empty set) is treated like a subquery returning one row instead, containing a null value. In other words, SQL treats this situation as if there were an employee 99999 with an unknown date of birth. This may sound strange; however, this behavior is fully compliant with the ANSI/ISO SQL standard.