What are the differences between GROUP BY and ORDER BY...the manual is not clear on this
GROUP BY is a way to sub-total your results, or perform some
other "aggregate" function on them.
SELECT department, sum(salary)
GROUP BY department;
will give you salary totals by department, whereas the sum statement by
itself would just give you the grand total of all salaries in
ORDER BY is simply a way to sort your results - it does not affect what
shows up in your resultset, only what order it is displayed.
ORDER BY lastname;
will give you all tblEmployee data, in order of last name. If you want
the results in descending (reversed) order, simply add DESC to the end
of the clause:
ORDER BY lastname DESC;
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The answer to this is two-fold.Yes. MySQL _DOES_ allow the creation of foreign key constraints...
I think you got this message from PHP.You get this message when you're trying to access $result...
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