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  • store result

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    hi,
    is there is any way so that i can store the result
    of
    a select query and execute a delete query on the
    same
    table with out using any other buffer?
    T h a n k s & R e g a r d s ,
    Manoj M | Webyog | Bangalore | Voice: 91 9886171984, 91 80 51216434(off)
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  • No.1 | | 452 bytes | |

    1/19/06, manoj marathayil <manojmarathayil (AT) yahoo (DOT) co.inwrote:

    hi,
    is there is any way so that i can store the result
    of
    a select query and execute a delete query on the
    same
    table with out using any other buffer?

    How about:

    select id
    into temp_table
    from source_table
    where somecondition = true;

    delete from source_table
    where id in ( select id from temp_table );

  • No.2 | | 1250 bytes | |

    Jay Sprenkle wrote:

    >
    >>is there is any way so that i can store the result
    >>of a select query and execute a delete query on the
    >>same table with out using any other buffer?
    >
    >>
    >
    >How about:
    >
    >select id
    into temp_table
    from source_table
    >where somecondition = true;
    >
    >delete from source_table
    >where id in ( select id from temp_table );
    >

    Jay,

    I don't believe there is an option to "select into" in SQLite. So your
    first statement should probably be a "create as". Also, you should
    delete the temp table after the delete. Your solution should read like this:

    create temp temp_table as
    select id from source_table where some_condition = true;
    delete from source_table
    where id in (select id from temp_table);
    drop temp_table;

    But I have to wonder why you suggest creating the temp table at all when
    this does the same thing:

    delete from source_table
    where id in
    (select id from source_table where some_condition = true);

    Dennis Cote

  • No.3 | | 343 bytes | |

    Dennis Cote wrote:
    But I have to wonder why you suggest creating the temp table at all
    when this does the same thing:

    delete from source_table
    where id in
    (select id from source_table where some_condition = true);

    even

    delete from source_table
    where some_condition = true;

    Igor Tandetnik

  • No.4 | | 1043 bytes | |

    I don't believe there is an option to "select into" in SQLite. So your
    first statement should probably be a "create as". Also, you should
    delete the temp table after the delete. Your solution should read like this:

    ! Too many database syntax records in my head at the same time!

    create temp temp_table as
    select id from source_table where some_condition = true;
    delete from source_table
    where id in (select id from temp_table);
    drop temp_table;

    But I have to wonder why you suggest creating the temp table at all when
    this does the same thing:

    He said he wanted to do some processing before deleting the records.

    I do something similar when printing letters from a live system. I
    take a snapshot
    into a temp table, export the data to the printing process, and then
    if that suceeds
    I mark the records as printed using the temp table. If I didn't use a
    snapshot records
    added while the process runs will be marked as printed when they really are not.

  • No.5 | | 492 bytes | |

    Igor Tandetnik wrote:

    Dennis Cote wrote:
    >
    >But I have to wonder why you suggest creating the temp table at all
    >when this does the same thing:
    >>
    >delete from source_table
    >where id in
    >(select id from source_table where some_condition = true);
    >
    >
    even

    delete from source_table
    where some_condition = true;

    Igor Tandetnik
    --
    Good point.

  • No.6 | | 1134 bytes | |

    1/19/06, manoj marathayil <manojmarathayil (AT) yahoo (DOT) co.inwrote:
    ok this i can do, but the problem is i need to select a set of records and i want to manipulate with each record then only i need to delete that record

    That's why I had it separated. Select the set into a temporary table.
    Process the records
    listed in the temporary table. Then delete them when you're finished
    using the temporary
    table to define what to delete:

    delete from source_table
    where id in ( select id from temp_table );

    Jay Sprenkle <jsprenkle (AT) gmail (DOT) comwrote: 1/19/06, manoj marathayil wrote:

    hi,
    is there is any way so that i can store the result
    of
    a select query and execute a delete query on the
    same
    table with out using any other buffer?

    How about:

    select id
    into temp_table
    from source_table
    where somecondition = true;

    delete from source_table
    where id in ( select id from temp_table );
    >
    >
    >
    Send instant messages to your online friends http://in.messenger.yahoo.com

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