May 2000
Intermediate to advanced
594 pages
11h 32m
English
Content preview from Oracle PL/SQL Programming: A Developer's Workbook
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Intermediate
14-10. | Are parameters in PL/SQL passed by value or by reference? |
14-11. | How many RETURNs should the executable section of a function contain? |
14-12. | Should you include RETURNs in your function’s exception section? |
14-13. | Should the following function have an exception section? If so, what should it handle? CREATE OR REPLACE FUNCTION deptname (
id_in IN department.department_id%TYPE
)
RETURN VARCHAR2
IS
retval department.name%TYPE;
BEGIN
SELECT name
INTO retval
FROM department
WHERE department_id = id_in;
RETURN retval;
END deptname;
/ |
14-14. | What are the restrictions on setting default values for parameters? |
14-15. | What advantage is there to providing default values for parameters? |
14-16. | Suppose that five years ago, a developer wrote a procedure with the following header: PROCEDURE calc_totals ( department_id_in IN department.department_id%TYPE) There are many calls to this procedure in a variety of production applications. A new requirement has now been requested by users to be able to calculate totals per department and also for sections within departments. How would you change the header of calc_totals so that:
|
14-17. | Can you skip over parameters when you call a procedure or function? |
14-18. | Given the header for the calc_profit procedure: PROCEDURE calc_profit (company_id_in IN NUMBER, profit_out OUT NUMBER fiscal_year_in IN NUMBER, profit_type_in IN VARCHAR2 := 'NET_PROFITS', ... |
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.