RE: Sql query

Roland,
There has been a thread in the last 2 days on here that compare various ways of doing what you want.
I have posted the original question and various answers below. I am sure you can work out the rest

HTH John
>>>>>>>>>>
select personid from person
where not exists (select '1' from phonenumber where personid = person.personid);

SELECT pn.personid

    FROM phonenumber pn
    WHERE NOT EXISTS (
    SELECT NULL FROM person p WHERE p.personid=pn.personid);

--

select a.id from person a, phonenumber b 
where a.id = b.id(+) 
and b.id is null; 

Nils Höglund wrote:


> 

> Hello,

> 

> I have encountered a performance problem. I use "Oracle8 Enterprise

Edition


> Release 8.0.5.0.0 - Production."

> 

> I have two tables. "phonenumber" and "person", each person has none, one

or


> many phonenumbers referenced to him.

> 

> The phonenumber-table is structured like:

> phonenumber.personid

> phonenumber.phonenumber

> 

> The person-table is structured like:

> person.personid

> person.name

> person.address

> 

> I wan't to know which persons that does NOT have any phonenumber(s).

> 

> I can write the query as:

> SELECT personid FROM phonenumber WHERE personid NOT IN (

>    SELECT personid FROM person);

> 

> However, since my tables are quite large, it takes forever to run my

query.


> In the real database both (or

> atleast one) of "person" or "phonenumber" are views.

> 

> To figure out who _does_ have phonenumbers is SIGNIFICANTLY faster.

> (SELECT DISTINCT person.personid FROM person, phonenumber WHERE

> person.personid=phonenumber.personid)

> 

> I'm wondering how I could restructure or rewrite my query ("who doesn't

have


> any phoinenumbers?") to run faster,

> or if there is anything else I can do to optimize the query?


-----Original Message-----
Sent: 26 June 2002 14:14
To: Multiple recipients of list ORACLE-L


Hallo,

anyone whom can give me an example on how to pick out field id and name from
table one and get only the id's  that exists in table one doesnt exist in
table2.

Thanks in advance

Roland

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  INET: John.Hallas_at_vodafone.co.uk

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