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It joins the two tables (using an equijoin) over all columns they have in common. It suppresses the duplicate columns resulting from the join operation in the previous step. This is why you don t get an error message about MSAL and DEPTNO in the SELECT clause being ambiguously defined. Finally, the NATURAL JOIN operator evaluates the remaining query clauses. In Listing 8-9, the only remaining clause is the SELECT clause. The final result shows the desired four columns.

We return when there is an error, which will cause the add form to be redrawn. We can also update the form template in root/authusers/add.tt to add a warning, using the errors we added to the stash.

Apparently, every employee occurs only once in the result, except WARD. This means that this employee has been employed by the same department (30) for the same salary (1250) during two distinct periods of his career. This is a pure coincidence. If the query had returned 14 rows instead of 15, we would probably not have been triggered to investigate the query for correctness. Remember that some wrong queries may give correct results by accident. This example shows that you should be very careful when using the NATURAL JOIN operator. Probably the biggest danger is that a natural join may suddenly start producing strange and undesirable results if you add new columns to your tables, or you rename existing columns, thus accidentally creating matching column names.

Figure 10-22. In the Report Options dialog, the various types conform to the different screens in the Report Writer Wizard.

Caution Natural joins are safe only if you practice a very strict column-naming standard in your database designs.

Note Checking that the username is available is left as an exercise for the reader. Also see the section

s Note You don t select fields that appear in the report from this tool initially. The fields are inserted into

SQL offers an alternative way to specify equijoins, allowing you to explicitly specify the columns you want to participate in the equijoin operation. As you saw in Listing 8-8, you can use the ON clause followed by fully specified join predicates. You can also use the USING clause, specifying column names instead of full predicates. See Listing 8-10 for an example. Listing 8-10. JOIN ... USING Example select e.ename, e.bdate , h.deptno, h.msal from employees e join history h using (empno) where e.job = 'ADMIN'; ENAME -------JONES MILLER MILLER MILLER MILLER BDATE DEPTNO MSAL ----------- -------- -------03-DEC-1969 30 800 23-JAN-1962 10 1275 23-JAN-1962 10 1280 23-JAN-1962 10 1290 23-JAN-1962 10 1300

Our First Template in 3 where we wrote some error trapping in our end action for a graceful way of handling the error screen.

Note that you need tuple variables again, because you join over only the EMPNO column; the columns h.DEPTNO and e.DEPTNO are now different. Figure 8-3 shows the syntax diagram of the ANSI/ISO join syntax, including the NATURAL JOIN operator, the ON clause, and the USING clause.

the report after this tool is closed and the report designer environment is opened. The Options tab of the Report Options dialog lists fields in a drop-down box. Until fields have been inserted into the report from the design environment, these options aren t relevant. You should use the Report Options dialog when it opens initially to define basic parameters for the report, such as the number of columns and margin settings, and then use the design environment to refine the report further.

Figure 8-3. ANSI/ISO join syntax diagram Note that you can also use a CROSS JOIN syntax. The result is identical to the effect of the comma operator in the FROM clause: the Cartesian product. The examples in the remainder of this book will show a mixture of old-fashioned joins (as introduced in Section 8.2) and the alternative ANSI/ISO SQL join syntax explained in this section.