Cursor and case function

  • I'm trying to update the permitnum in the table below where PERMITNUM is equal to permit_1 for the first row within that same APN, equal to permit_2 for the second row within that same APN, equal to permit_3 for the third row within that same APN and so on. Noting that If I have more than 8 records under the same APN then permitnum would equal permit_8 + '_9' for row 9, permit_8 + '_10' for row 10 and so on.

    Also when the APN changes the ID resets and the same logic applies.

    --===== If the test table already exists, drop it

    IF OBJECT_ID('TempDB..#mytable','U') IS NOT NULL

    DROP TABLE #mytable

    --===== Create the test table with

    CREATE TABLE #mytable

    ( ID INT,APN varchar(30), PERMITNUM varchar(30), PERMIT1 varchar(30),PERMIT2 varchar(30),PERMIT3 varchar(30),PERMIT4 varchar(30),PERMIT5 varchar(30),

    PERMIT6 varchar(30),PERMIT7 varchar(30),PERMIT8 varchar(30))

    --===== Insert test data into mytable

    insert into #mytable (ID, APN, PERMITNUM, PERMIT1, PERMIT2, PERMIT3, PERMIT4, PERMIT5, PERMIT6, PERMIT7, PERMIT8)

    select 1,'382-070-41-00',NULL,'18027','36027','41323','45953',NULL,NULL,NULL,NULL union all

    select 2,'382-070-41-00',NULL,'18027','36027','41323','45953',NULL,NULL,NULL,NULL union all

    select 3,'382-070-41-00',NULL,'18027','36027','41323','45953',NULL,NULL,NULL,NULL union all

    select 4,'382-070-41-00',NULL,'18027','36027','41323','45953',NULL,NULL,NULL,NULL union all

    select 1,'382-070-67-00',NULL,'18542','23747','33782','39306','39918','45482',NULL,NULL union all

    select 2,'382-070-67-00',NULL,'18542','23747','33782','39306','39918','45482',NULL,NULL

    --=====Cursor script written so far but not working

    DROP TABLE APN_MANY_BUS_PERMITS_CURSOR

    GO

    CREATE TABLE [dbo].[APN_MANY_BUS_PERMITS_CURSOR](

    [ID] [bigint] NULL,

    [apn] [nvarchar](30),

    [permitnum] [nvarchar](30),

    [permit1] [nvarchar](30),

    [permit2] [nvarchar](30),

    [permit3] [nvarchar](30),

    [permit4] [nvarchar](30),

    [permit5] [nvarchar](30),

    [permit6] [nvarchar](30),

    [permit7] [nvarchar](30),

    [permit8] [nvarchar](30)

    ) ON [PRIMARY]

    GO

    SET NOCOUNT ON

    GO

    DECLARE

    @ID int,

    @apn varchar(255),

    @permitnum varchar(30),

    @permit1 varchar(30),

    @permit2 varchar(30),

    @permit3 varchar(30),

    @permit4 varchar(30),

    @permit5 varchar(30),

    @permit6 varchar(30),

    @permit7 varchar(30),

    @permit8 varchar(30),

    @ID_new int,

    @apn_new varchar(255),

    @ID_old int,

    @apn_old varchar(255)

    SET @apn_old ='382-070-41-00'

    SET @id_old = 1

    DECLARE wf_cursor CURSOR FAST_FORWARD FOR

    selectID,

    apn,

    permit1,

    permit2,

    permit3,

    permit4,

    permit5,

    permit6,

    permit7,

    permit8

    from #Mytable

    order by APN,ID

    OPEN wf_cursor

    FETCH NEXT FROM wf_cursor INTO

    @ID,

    @apn,

    @permit1,

    @permit2,

    @permit3,

    @permit4,

    @permit5,

    @permit6,

    @permit7,

    @permit8

    WHILE (@@FETCH_STATUS = 0)

    BEGIN

    --SET @apn_old = @apn

    --SET@id_old= @id

    BEGIN

    INSERT INTO APN_MANY_BUS_PERMITS_CURSOR

    (id,

    apn,

    permitnum,

    permit1,

    permit2,

    permit3,

    permit4,

    permit5,

    permit6,

    permit7,

    permit8)

    VALUES (@ID,

    @apn,

    null,

    @permit1,

    @permit2,

    @permit3,

    @permit4,

    @permit5,

    @permit6,

    @permit7,

    @permit8)

    END

    BEGIN

    IF @apn = Ltrim(@apn_old) and @id = 1

    BEGIN

    UPDATE APN_MANY_BUS_PERMITS_CURSOR

    set permitnum =

    case

    when id = 1 then permit1

    when id = 2 then permit2

    when id = 3 then permit3

    where @apn = @apn_old

    END

    END

    SET @apn_old = @apn

    SET@id_old = @id

    FETCH NEXT FROM wf_cursor INTO

    @ID,

    @apn,

    @permit_1,

    @permit_2,

    @permit_3,

    @permit_4,

    @permit_5,

    @permit_6,

    @permit_7,

    @permit_8

    END

    CLOSE wf_cursor

    DEALLOCATE wf_cursor

    GO

  • What do you need that c.u.r.s.o.r. for?

    Unless I'm missing something, the following statement should do it:

    UPDATE #mytable

    set permitnum =

    case

    when id = 1 then permit1

    when id = 2 then permit2

    when id = 3 then permit3

    ...

    END



    Lutz
    A pessimist is an optimist with experience.

    How to get fast answers to your question[/url]
    How to post performance related questions[/url]
    Links for Tally Table [/url] , Cross Tabs [/url] and Dynamic Cross Tabs [/url], Delimited Split Function[/url]

  • I guess my other question would be, what happens when there are more than 8 permits?

    --Jeff Moden


    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.


    Helpful Links:
    How to post code problems
    How to Post Performance Problems
    Create a Tally Function (fnTally)

  • There can only be a maximum of 8 permits per record. There can be more than 8 records per APN in which case the permitnum would equal permit_8 + '_9' for row 9, permit_8 + '_10' for row 10 and so on...

  • frecapi (2/14/2011)


    There can only be a maximum of 8 permits per record. There can be more than 8 records per APN in which case the permitnum would equal permit_8 + '_9' for row 9, permit_8 + '_10' for row 10 and so on...

    Sorry... looking back, I see you included that in the original post.

    Have you considered normalizing the table so that you only have one permit per row?

    --Jeff Moden


    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.


    Helpful Links:
    How to post code problems
    How to Post Performance Problems
    Create a Tally Function (fnTally)

  • No I didn't think about that. Something like:

    Select ID, apn, (select permit_1 from #mytable), from #mytable union all

    Select ID, apn, (select permit_2 from #mytable), from #mytable....

  • frecapi (2/14/2011)


    No I didn't think about that. Something like:

    Select ID, apn, (select permit_1 from #mytable), from #mytable union all

    Select ID, apn, (select permit_2 from #mytable), from #mytable....

    Yep... kind of. You need to have something in there so you don't include nulls for permits that don't exist. Then you could also have start and end dates for each permit. Every APN could have 1 to as many permits as you need without worrying about running out of columns.

    --Jeff Moden


    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.


    Helpful Links:
    How to post code problems
    How to Post Performance Problems
    Create a Tally Function (fnTally)

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