Count(*)
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  1. #1
    Join Date
    Jul 2001
    Posts
    334

    Count(*)

    Hi,
    I have 3 tables

    BATCHES(pk batch_id)
    INVOICES(pk invoice_id, fk batch_id)
    INVOICES_LINES(fk invoice_id)

    Consider we have batch and it has 6 invoices and each invoice has 10 lines. We need to count the invoice under the batch and also count the lines of all invoices.

    The out put I am looking is
    Batch Invoice lines
    ----- ------- -----
    INV 6 60

    What query I can write to get the above result.

    Thanks in advance.

  2. #2
    Join Date
    Aug 2002
    Location
    Colorado Springs
    Posts
    5,253
    select i.batch_id,
    count(distinct i.invoice_id) invoice,
    count(*)
    from invoices i, invoice_lines il
    where i.invoice_id = il.invoice_id
    David Aldridge,
    "The Oracle Sponge"

    Senior Manager, Business Intelligence Development
    XM Satellite Radio
    Washington, DC

    Oracle ACE

  3. #3
    Join Date
    Sep 2001
    Location
    NJ, USA
    Posts
    1,287
    Code:
    select b.batch_name,
          (select count(*) from invoices i where b.batch_id = i.batch_id ) cnt_inv,
          (select count(*) from invoices i,
                                invoices_lines l
           where b.batch_id = i.batch_id and
                 i.invoice_id = l.invoice_id ) cnt_lines
    from batches b;

  4. #4
    Join Date
    Jul 2001
    Posts
    334
    Hi Shestakov,
    Thanks of your reply, Can we use this technique in 7.3.4, because when I run this query I get the below syntax error.

    ERROR at line 2:
    ORA-00936: missing expression

    Thanks,

  5. #5
    Join Date
    Dec 2000
    Location
    Ljubljana, Slovenia
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    4,439
    No, you can't use this in 7.3. But what's wrong with slimdave's suggestion? You can use it with any Oracle release you want...
    Jurij Modic
    ASCII a stupid question, get a stupid ANSI
    24 hours in a day .... 24 beer in a case .... coincidence?

  6. #6
    Join Date
    May 2002
    Posts
    108

    But what's wrong with slimdave's suggestion?


    select i.batch_id,
    count(distinct i.invoice_id) invoice,
    count(*)
    from invoices i, invoice_lines il
    where i.invoice_id = il.invoice_id



    Less complicated query and will yield the expected output.
    But shouldn't it also include a GROUP BY clause for the i.Batch_id column?!

    select i.batch_id, count(distinct i.invoice_id) invoice,
    count(*) from invoices i, invoice_lines il
    where i.invoice_id = il.invoice_id
    GROUP BY i.Batch_id

    - Nandu
    Never give up !

    Nanda Kumar - Vellore

  7. #7
    Join Date
    Aug 2002
    Location
    Colorado Springs
    Posts
    5,253

    Re: But what's wrong with slimdave's suggestion?

    ... shouldn't it also include a GROUP BY clause for the i.Batch_id column?! ...
    pesky details! i suppose so.
    David Aldridge,
    "The Oracle Sponge"

    Senior Manager, Business Intelligence Development
    XM Satellite Radio
    Washington, DC

    Oracle ACE

  8. #8
    Join Date
    Jul 2001
    Posts
    334
    There is nothing wrong with slimdave's suggestion. The only things I was investigating why we can not use SELECT in a column.

    * Slimdave, Thanks for you help, I really appreciate.

    Thanks.

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