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Home -> Community -> Mailing Lists -> Oracle-L -> RE: help on "the" operator
Get rid of select from dual! Hah, the next thing you will suggest is that we
convert to the metric system!
Marge: Now, I know you haven't liked some of my past suggestions, like
switching to the metric system --
Abe: The metric system is the tool of the devil! My car gets forty rods to
the hogshead and that's the way I likes it.
- The Simpsons episode "A Star is Burns"
-----Original Message-----
Sent: Thursday, March 07, 2002 11:29 AM
To: Multiple recipients of list ORACLE-L
The "the()" operator, which changed to the "table()" operator in 8.1 takes a single value that has to be a nested table or varray as its operand.
What you are casting is the single row and single column that you select from dual, but that single item is the result of casting a result set into a nested table or varray.
In fact in Oracle 9, you can get rid of the select from dual, and for a function returning the varray/nested table write:
select * from table(function_name);
or, if TABX is a table with a column COLX
select colx, function_name(colx)
from TABX;
You can play similar games with 8.1, but
the SQL looks messier. You may then
need to wrap one level of SQL inside an
inline view to convert the whole thing into
a flattened table.
Jonathan Lewis
http://www.jlcomp.demon.co.uk
Next Seminar - UK, April 3rd - 5th
http://www.jlcomp.demon.co.uk/seminar.html
Host to The Co-Operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html
Author of:
Practical Oracle 8i: Building Efficient Databases
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Author: Post, Ethan
INET: Ethan.Post_at_ps.net
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Author: Post, Ethan
INET: Ethan.Post_at_ps.net
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