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linking null records

Discussion in 'Information Technology' started by alex, Jul 28, 2006.

  1. alex

    alex
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    Guest

    Hello experts.

    I'm writing a query to join two tables. I'm linking columns in
    each table with a one-to-one relationship.

    As you probably know, linking columns with null record results returns
    no records. Is there a way to change this? I.e., how do you match
    null records?

    Thanks for any help.
     
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  3. Allen Browne

    Allen Browne
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    Guest

    If you enter the SQL statement manually, it is possible to set up non-equi
    JOINs:

    SELECT Table1.*
    FROM Table1 INNER JOIN Table2
    ON ((Table.ID = Table2.ID) OR (Table1.ID Is Null AND Table2.ID Is Null));

    --
    Allen Browne - Microsoft MVP. Perth, Western Australia.
    Tips for Access users - http://allenbrowne.com/tips.html
    Reply to group, rather than allenbrowne at mvps dot org.

    "alex" <sql_aid@yahoo.com> wrote in message
    news:1148313130.519998.276130@u72g2000cwu.googlegroups.com...
    > Hello experts.
    >
    > I'm writing a query to join two tables. I'm linking columns in
    > each table with a one-to-one relationship.
    >
    > As you probably know, linking columns with null record results returns
    > no records. Is there a way to change this? I.e., how do you match
    > null records?
    >
    > Thanks for any help.
     
  4. Pieter Wijnen

    Pieter Wijnen
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    Guest

    Probably just looking for outer joins?
    SELECT Table1.*, Table2.*
    FROM Table1 LEFT JOIN Table2
    ON Table.ID = Table2.ID

    or

    SELECT Table1.*, Table2.*
    FROM Table1 RIGHT JOIN Table2
    ON Table.ID = Table2.ID

    Pieter

    who'd want a table with a null for ID <g>

    "Allen Browne" <AllenBrowne@SeeSig.Invalid> wrote in message
    news:%231ilumbfGHA.452@TK2MSFTNGP02.phx.gbl...
    > If you enter the SQL statement manually, it is possible to set up non-equi
    > JOINs:
    >
    > SELECT Table1.*
    > FROM Table1 INNER JOIN Table2
    > ON ((Table.ID = Table2.ID) OR (Table1.ID Is Null AND Table2.ID Is Null));
    >
    > --
    > Allen Browne - Microsoft MVP. Perth, Western Australia.
    > Tips for Access users - http://allenbrowne.com/tips.html
    > Reply to group, rather than allenbrowne at mvps dot org.
    >
    > "alex" <sql_aid@yahoo.com> wrote in message
    > news:1148313130.519998.276130@u72g2000cwu.googlegroups.com...
    >> Hello experts.
    >>
    >> I'm writing a query to join two tables. I'm linking columns in
    >> each table with a one-to-one relationship.
    >>
    >> As you probably know, linking columns with null record results returns
    >> no records. Is there a way to change this? I.e., how do you match
    >> null records?
    >>
    >> Thanks for any help.

    >
    >
     
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