Select from huge data using constraints.

Hi All,
Good morning.
I am Bhargav, I have a table(rem1) with structure as below:
msgid varchar2(32) primary key,
req_id varchar2(15)
enq_tid varchar2(12)
and another table(rem2) with structure as below:
req_id varchar2(15) primary key
Each table has around 2.7 million records
I want to select the rows from rem1 where the req_ids are not in rem2 table. I used the below query as:
select msgid,enq_tid from remq where req_id not in (select req_id from req_id);
but it takes age. Please suggest me the best query using any joins or some other logic.
Thanks alot.
Bhargava Sriram.

Among the options
SELECT req_id FROM rem1
MINUS
SELECT req_id FROM rem2or
SELECT req_id
FROM rem1
WHERE NOT EXISTS (
    SELECT 1
      FROM rem2
     WHERE rem2.req_id = rem1.req_id
   )Justin

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Hi
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Dear All,
Following query is running fine.
with t as (select XMLType('<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope">
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                     <CountryName>Country Name</CountryName>
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                  <Telephone>
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                        <SubscriberID>0711/123456</SubscriberID>
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                        <CountryCode>DE</CountryCode>
                        <CountryDiallingCode>+49</CountryDiallingCode>
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                     <UsageDeniedIndicator>false</UsageDeniedIndicator>
                     <MobilePhoneNumberIndicator>false</MobilePhoneNumberIndicator>
                     <SMSEnabledIndicator>false</SMSEnabledIndicator>
                     <DefaultIndicator>true</DefaultIndicator>
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                  <Telephone>
                     <Number>
                        <SubscriberID>0711/999999</SubscriberID>
                        <CountryCode>DE</CountryCode>
                        <CountryDiallingCode>+49</CountryDiallingCode>
                        <CountryName languageCode="de">Country Name</CountryName>
                     </Number>
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                     <SMSEnabledIndicator>true</SMSEnabledIndicator>
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                        <SubscriberID>0711/999888</SubscriberID>
                        <ExtensionID>99</ExtensionID>
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                        <CountryDiallingCode>+49</CountryDiallingCode>
                        <CountryName languageCode="de">Country Name</CountryName>
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                     <DefaultIndicator>true</DefaultIndicator>
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      </nm:CustomerCRMByIDResponse>
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</env:Envelope>') xml_data from dual)
SELECT xmlresponse.*
FROM t, XMLTable(Xmlnamespaces('http://www.w3.org/2003/05/soap-envelope' AS "env",
                                                                  'http://sap.com/xi/CRM/Global2' AS "nm",
                                                                  'urn:sap.com:proxy:DCT:/1SAI/TAS57DF0B317943DEAE3C49:702' AS "prx"
                                        'for $BusinessPartner in /env:Envelope/env:Body/nm:CustomerCRMByIDResponse/BusinessPartner
                    return $BusinessPartner'
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                                        COLUMNS
                                        Internalid Varchar2(4000) Path 'InternalID'
                                        ) xmlresponse;As you can see, one "BusinessPartner" can have multiple "AddressInformation"
and one "AddressInformation" can have multiple "Telephone".
Can someone suggest me how can I extract both InternalID & UUID in one query? For above example output should look as follows..
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2200117598 51471396-9ae8-3cc0-e100-80000a031a28
2200117598 514a519b-39a2-4890-e100-80000a031a28Thank you very much in advance.
Regards,
Hari

Here is a basic example of one method to achieve what you need
SELECT xmlresponse.Internalid, xml2.uuid
FROM t,
       XMLTable(Xmlnamespaces('http://www.w3.org/2003/05/soap-envelope' AS "env",
                              'http://sap.com/xi/CRM/Global2' AS "nm"
                '/env:Envelope/env:Body/nm:CustomerCRMByIDResponse/BusinessPartner'
                PASSING xml_data
                COLUMNS
                Internalid   Varchar2(20) Path 'InternalID',
                addrinfoxml XMLType      PATH 'AddressInformation'
               ) xmlresponse,
       XMLTable('/AddressInformation'
                PASSING xmlresponse.addrinfoxml
                COLUMNS
                UUID         Varchar2(80) Path 'UUID'
               ) xml2;Changes:
I removed one of namespaces as you only need to include those included in an XPath statement.
I shortened your datatypes.
I went for the simple XMLTable joined to an XMLTable approach, instead of a single XMLTable using a FLWOR statement.
You can include the addrinfoxml column to your SELECT list to see the data being passed between the two if you want.
Addition:
Here's one approach for a single XMLTable.
SELECT xmlresponse.*
FROM t,
       XMLTable(Xmlnamespaces('http://www.w3.org/2003/05/soap-envelope' AS "env",
                              'http://sap.com/xi/CRM/Global2' AS "nm"
                'for $BP in /env:Envelope/env:Body/nm:CustomerCRMByIDResponse/BusinessPartner
                  for $ai in $BP /AddressInformation
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                PASSING xml_data
                COLUMNS
                Internalid   Varchar2(20) Path 'InternalID',
                UUID         Varchar2(80) Path 'UUID'
               ) xmlresponse;Edited by: A_Non on Mar 25, 2013 9:41 AM
Added in XQuery solution

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Hi
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