Update with an Outer Join

I want to update a column in a table by selecting a value from one of three tables (in a particular order) based on whether the key value in the table being updated is in one (or more) of those tables.
In other words:
There are four tables
The main table, main_table, has columns "key" and "title"; all rows have a key value but their title values are null
The three column lookup tables, table_1, table_2, and table_3; each also has columns "key" and "title", but in this case, each row has its key and title values not null
Each main_table's title is set as follows:
If the key value is in table_1, use the title from tabke_1
If the key value is not in table_1 but it is in table_2, use the title from table_2
If the key value is not in table_1 or table_2 but it is in table_3, use the title from table_3
If the key value is not in any of the three other tables, set it to null
I am also trying not to use the "(+)" terminology.
Is there any way of writing a single UPDATE statement that does this?
I can't find any way of doing it off the top of my head without using three separate UPDATE statements (one using table_1, one using table_2, and one using table_3, with the latter two limited to "main_table.title is null".
-- Don

This?
SQL> select * from main_table;
       KEY TITLE
         1
         2
         3
         4
         5
         6
6 rows selected
SQL>
SQL> update main_table mt set title =
2 (select title from
3 (
4 select v1.key, v1.title from
5 (
6 select key, title, 1 sortcol from table_1 union
7 select key, title, 2 sortcol from table_2 union
8 select key, title, 3 sortcol from table_3
9 ) v1
10 inner join
11 (
12 select key, min(sortcol) sortcol from
13 (
14 select key, 1 sortcol from table_1 union
15 select key, 2 sortcol from table_2 union
16 select key, 3 sortcol from table_3
17 )
18 group by key
19 ) v2
20 on v1.key=v2.key and v1.sortcol = v2.sortcol
21 )
22 where key = mt.key);
6 rows updated
SQL> select * from main_table;
       KEY TITLE
         1 t11
         2 t12
         3 t23
         4 t24
         5
         6 t36
6 rows selectedAnd the content of table_1, table_2, table_3 is:
SQL> select * from table_1;
       KEY TITLE
         1 t11
         2 t12
SQL> select * from table_2;
       KEY TITLE
         3 t23
         4 t24
         1 t21
SQL> select * from table_3;
       KEY TITLE
         6 t36
         4 t34

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  • What is IS NULL doing in replacing NOT EXISTS operator with an outer join?

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  • Need help with an Outer Join

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    Edited by: George Heller on Jun 30, 2011 9:47 AM

    fabio_silva wrote:
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    ----------  JOIN ----------
    | Alias M | ====> | Alias L |
    | Alias PM |
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             2 T 2
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             3 T1 3
             4 T1 4
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    Hi,
    >>SQL> conn ifsinfo/******@DB
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    Wrote file afiedt.buf
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    6 ifsapp.vmo_company vc
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    8 ifsapp.customer_info ci
    9 on
    10* vc.custno = ci.customer_id
    SQL> /
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    Cheers

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    I have a query wihch looks like ,
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    where (some join conditions)
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      Here goes my first query that uses UNION :
    SELECT  from_it.seq_routing,
           from_it.milestone_routing_dt,
           from_it.milestone_type_desc,
           to_it.seq_routing,
           to_it.milestone_routing_dt,
           to_it.milestone_type_desc,
           to_it.delay_flag,
           to_it.acceptable_delay_flag,
           TAB_A.calendar_minutes, TAB_A.business_minutes,
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           TAB_A.delay_concat_comments,TAB_C.TAB_C_key,
           TAB_C.pcd,TAB_C.ssn,
           mmp.MEASURE_NAME,
           api.METRICS_PARAMETER_KEY,
    api.METRICS_PARAMETER_PRODUCT_KEY,
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    crt.JUSTIFICATION_DESC,
    crt.ROUTING_USER_SITE_DESC
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      TAB_C, TAB_E,TAB_D mmp,TAB_F api, TAB_G crt
    WHERE from_it.TAB_B_key =
                                      TAB_A.from_TAB_B_key
       AND to_it.TAB_B_key =
                                        TAB_A.to_TAB_B_key
       ANDTAB_C.TAB_C_key = from_it.TAB_C_key
       andTAB_C.TAB_C_key = to_it.TAB_C_key
       and TAB_E.pck =crt.pck
       and to_it.SEQ_ROUTING  =crt.SEQ_ROUTING
       and TAB_E.pcd =TAB_C.pcd
       and TAB_E.ssn =TAB_C.ssn
       andTAB_C.END_DT = TO_DATE('12/31/9999', 'MM/DD/YYYY')
       and TAB_A.METRICS_MEASURE_KEY =mmp.METRICS_MEASURE_KEY
       andapi.END_DT = TO_DATE('12/31/9999', 'MM/DD/YYYY')
       andTAB_C.TAB_C_key =api.TAB_C_KEY
       andapi.PARAMETER_TYPE = 'IN'
    and TAB_A.end_dt = TO_DATE('12/31/9999', 'MM/DD/YYYY')
    and CRT.end_dt  = TO_DATE('12/31/9999', 'MM/DD/YYYY')
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           from_it.milestone_routing_dt,
           from_it.milestone_type_desc,
           to_it.seq_routing,
           to_it.milestone_routing_dt,
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           TAB_A.delay_concat_comments,TAB_C.TAB_C_key,
           TAB_C.pcd,TAB_C.ssn,
           mmp.MEASURE_NAME,
           api.METRICS_PARAMETER_KEY,
    api.METRICS_PARAMETER_PRODUCT_KEY,
    NULL, NULL, NULL
      FROM TAB_A, TAB_B from_it, TAB_B to_it,
      TAB_C, TAB_E,TAB_D mmp,TAB_F api
    WHERE from_it.TAB_B_key =
                                      TAB_A.from_TAB_B_key
       AND to_it.TAB_B_key =
                                        TAB_A.to_TAB_B_key
       ANDTAB_C.TAB_C_key = from_it.TAB_C_key
       andTAB_C.TAB_C_key = to_it.TAB_C_key
       and TAB_E.pcd =TAB_C.pcd
       and TAB_E.ssn =TAB_C.ssn
       andTAB_C.END_DT = TO_DATE('12/31/9999', 'MM/DD/YYYY')
       and TAB_A.METRICS_MEASURE_KEY =mmp.METRICS_MEASURE_KEY
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       andTAB_C.TAB_C_key =api.TAB_C_KEY
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       and to_it.SEQ_ROUTING is null
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    And the one with OUTER JOIN used :
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           from_it.milestone_routing_dt,
           from_it.milestone_type_desc,
           to_it.seq_routing,
           to_it.milestone_routing_dt,
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    crt.ROUTING_USER_SITE_DESC
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  • Strange bug with Full Outer Join

    Hi guys,
    can you please confirm this behaviour on 11gR2? It used to work fine on 10gR1.
    Small test case:
    create table TEST_OBJECT_METADATA
      project_name  VARCHAR2(30 CHAR) not null,
      object_id     NUMBER not null
    create table TEST_OBJECT_INFO
      object_id          NUMBER not null,
      object_type        VARCHAR2(30) not null
    create table TEST_SUPPORTED_OBJECTS
      object_type    VARCHAR2(30 CHAR) not null,
      enabled        NUMBER(1));
    INSERT INTO TEST_OBJECT_METADATA VALUES ('NEW',1);
    INSERT INTO TEST_OBJECT_INFO VALUES (1, 'TABLE');
    INSERT INTO TEST_SUPPORTED_OBJECTS VALUES ('TABLE',1);
    COMMIT;When I execute the following query:
    WITH old_project AS
    (SELECT oi.object_type,
             oi.object_id
        FROM test_object_metadata om,
             test_object_info     oi
       WHERE om.object_id = oi.object_id
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    new_project AS
    (SELECT oi.object_type,
             oi.object_id
        FROM test_object_metadata om,
             test_object_info     oi
       WHERE om.object_id = oi.object_id
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    SELECT src.object_type,
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      FROM (SELECT nvl(o.object_type, n.object_type) object_type
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              FULL OUTER JOIN new_project n
                ON o.object_id = n.object_id) src,
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    OBJECT_TYPE     ENABLED
    TABLE             So, the outer join to test_supported_objects does not match.
    But if I force the FULL OUTER JOIN to run first using rownum:
    WITH old_project AS
    (SELECT oi.object_type,
             oi.object_id
        FROM test_object_metadata om,
             test_object_info     oi
       WHERE om.object_id = oi.object_id
         AND project_name = 'OLD'),
    new_project AS
    (SELECT oi.object_type,
             oi.object_id
        FROM test_object_metadata om,
             test_object_info     oi
       WHERE om.object_id = oi.object_id
         AND project_name = 'NEW')
    SELECT src.object_type,
               t.enabled
      FROM (SELECT nvl(o.object_type, n.object_type) object_type,
                           rownum
              FROM old_project o
              FULL OUTER JOIN new_project n
                ON o.object_id = n.object_id) src,
           test_supported_objects t
    WHERE src.object_type = t.object_type(+);I get the expected output:
    OBJECT_TYPE     ENABLED
    TABLE             1 Thanks in advance.

    Without mixing works fine:
    WITH old_project AS
    (SELECT oi.object_type,
             oi.object_id
        FROM test_object_metadata om,
             test_object_info     oi
       WHERE om.object_id = oi.object_id
         AND project_name = 'OLD'),
    new_project AS
    (SELECT oi.object_type,
             oi.object_id
        FROM test_object_metadata om,
             test_object_info     oi
       WHERE om.object_id = oi.object_id
         AND project_name = 'NEW')
    SELECT src.object_type,
           t.enabled
      FROM (SELECT nvl(o.object_type, n.object_type) object_type
              FROM old_project o,
                   new_project n   
              where  o.object_id = n.object_id(+)
              UNION
              SELECT nvl(o.object_type, n.object_type) object_type
              FROM old_project o,
                   new_project n   
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           test_supported_objects t
    WHERE src.object_type = t.object_type(+);but there shouldn't be any restrictions on mixing them, right?

  • [8i] Need help with full outer join combined with a cross-join....

    I can't figure out how to combine a full outer join with another type of join ... is this possible?
    Here's some create table and insert statements for some basic sample data:
    CREATE TABLE     my_tab1
    (     record_id     NUMBER     NOT NULL     
    ,     workstation     VARCHAR2(4)
    ,     my_value     NUMBER
         CONSTRAINT my_tab1_pk PRIMARY KEY (record_id)
    INSERT INTO     my_tab1
    VALUES(1,'ABCD',10);
    INSERT INTO     my_tab1
    VALUES(2,'ABCD',15);
    INSERT INTO     my_tab1
    VALUES(3,'ABCD',5);
    INSERT INTO     my_tab1
    VALUES(4,'A123',5);
    INSERT INTO     my_tab1
    VALUES(5,'A123',10);
    INSERT INTO     my_tab1
    VALUES(6,'A123',20);
    INSERT INTO     my_tab1
    VALUES(7,'????',5);
    CREATE TABLE     my_tab2
    (     workstation     VARCHAR2(4)
    ,     wkstn_name     VARCHAR2(20)
         CONSTRAINT my_tab2_pk PRIMARY KEY (workstation)
    INSERT INTO     my_tab2
    VALUES('ABCD','WKSTN 1');
    INSERT INTO     my_tab2
    VALUES('A123','WKSTN 2');
    INSERT INTO     my_tab2
    VALUES('B456','WKSTN 3');
    CREATE TABLE     my_tab3
    (     my_nbr1     NUMBER
    ,     my_nbr2     NUMBER
    INSERT INTO     my_tab3
    VALUES(1,2);
    INSERT INTO     my_tab3
    VALUES(2,3);
    INSERT INTO     my_tab3
    VALUES(3,4);And, the results I want to get:
    workstation     sum(my_value)     wkstn_name     my_nbr1     my_nbr2
    ABCD          30          WKSTN 1          1     2
    ABCD          30          WKSTN 1          2     3
    ABCD          30          WKSTN 1          3     4
    A123          35          WKSTN 2          1     2
    A123          35          WKSTN 2          2     3
    A123          35          WKSTN 2          3     4
    B456          0          WKSTN 3          1     2
    B456          0          WKSTN 3          2     3
    B456          0          WKSTN 3          3     4
    ????          5          NULL          1     2
    ????          5          NULL          2     3
    ????          5          NULL          3     4I've tried a number of different things, googled my problem, and no luck yet...
    SELECT     t1.workstation
    ,     SUM(t1.my_value)
    ,     t2.wkstn_name
    ,     t3.my_nbr1
    ,     t3.my_nbr2
    FROM     my_tab1 t1
    ,     my_tab2 t2
    ,     my_tab3 t3
    ...So, what I want is a full outer join of t1 and t2 on workstation, and a cross-join of that with t3. I'm wondering if I can't find any examples of this online because it's not possible....
    Note: I'm stuck dealing with Oracle 8i
    Thanks!!

    Hi,
    The query I posted yesterday is a little more complicated than it needs to be.
    Since my_tab2.workstation is unique, there's no reason to do a separate sub-query like mt1; we can join my_tab1 to my_tab2 and get the SUM all in one sub-query.
    SELECT       foj.workstation
    ,       foj.sum_my_value
    ,       foj.wkstn_name
    ,       mt3.my_nbr1
    ,       mt3.my_nbr2
    FROM       (     -- Begin in-line view foj for full outer join
              SELECT        mt1.workstation
              ,        SUM (mt1.my_value)     AS sum_my_value
              ,        mt2.wkstn_name
              FROM        my_tab1   mt1
              ,        my_tab2   mt2
              WHERE        mt1.workstation     = mt2.workstation (+)
              GROUP BY   mt1.workstation
              ,        mt2.wkstn_name
                    UNION ALL
              SELECT      workstation
              ,      0      AS sum_my_value
              ,      wkstn_name
              FROM      my_tab2
              WHERE      workstation     NOT IN (     -- Begin NOT IN sub-query
                                               SELECT      workstation
                                       FROM      my_tab1
                                       WHERE      workstation     IS NOT NULL
                                     )     -- End NOT IN sub-query
           ) foj     -- End in-line view foj for full outer join
    ,       my_tab3  mt3
    ORDER BY  foj.wkstn_name
    ,       foj.workstation
    ,       mt3.my_nbr1
    ,       mt3.my_nbr2
    ;Thanks for posting the CREATE TABLE and INSERT statements, as well as the very clear desired results!
    user11033437 wrote:
    ... So, what I want is a full outer join of t1 and t2 on workstation, and a cross-join of that with t3. That it, exactly!
    The tricky part is how and when to get SUM (my_value). You might approach this by figuring out exactly what my_tab3 has to be cross-joined to; that is, exactly what should the result set of the full outer join between my_tab1 and my_tab2 look like. To do that, take your desired results, remove the columns that do not come from the full outer join, and remove the duplicate rows. You'll get:
    workstation     sum(my_value)     wkstn_name
    ABCD          30          WKSTN 1          
    A123          35          WKSTN 2          
    B456          0          WKSTN 3          
    ????          5          NULL          So the core of the problem is how to get these results from my_tab1 and my_tab2, which is done in sub-query foj above.
    I tried to use self-documenting names in my code. I hope you can understand it.
    I could spend hours explaining different parts of this query in more detail, but I'm sure I'd waste some of that time explaining things you already understand. If you want an explanation of somthing(s) specific, let me know.

  • Can we join 3 tables with left outer join

    hi friends.
          Can any one tell how to join 3 tables using <b>left outer join</b>...i tried by taking some fields of <b>ekko,ekpo,eket</b>, but this not working ... plz give a sample code with some fields.

    Hi Uday
    <b>Inner joins using 3 tables </b>
    <i><b>Try this :-</b></i>
    SELECT stpo~stlnr stpo~idnrk mast~matnr mara~mtart stpo~menge 
    INTO CORRESPONDING FIELDS OF TABLE zmat1 FROM mast 
    JOIN stpo ON stpo~stlnr = mast~stlnr 
    JOIN mara ON mara~matnr = mast~matnr 
    WHERE stpo~stlty = 'M' "AND stpo~idnrk IN s_matnr 
    AND mast~werks = 1000.
    <b><i>Here s_matnr is a select-options on the selection-screen. </i></b>
    <i><b>Or this. </b></i>
    <b>Code: </b>
         Select single Vbrk~Bukrs Vbrk~Kunrg    Vbrk~Vbeln 
                       Vbrk~Fkdat Vbrk~Bstnk_Vf Vbrk~Zterm 
                       Tvzbt~Vtext 
                       Vbak~Vbeln Vbak~Bstdk 
                       Likp~Vbeln Likp~lfdat    Likp~Lfuhr 
           into w_vbrk 
           from vbrk 
          inner join       Tvzbt on Tvzbt~Zterm        = Vbrk~Zterm      and 
                                    Tvzbt~Spras        = sy-langu 
          Inner join       Vbfa  as SalesLnk 
                                 on SalesLnk~vbeln     = pu_vbeln        and 
                                    SalesLnk~vbtyp_v   = c_order 
                inner join Vbak  on Vbak~Vbeln           = SalesLnk~Vbelv
          Inner join       Vbfa  as DeliveryLnk 
                                 on DeliveryLnk~vbeln   = pu_vbeln       and 
                                    DeliveryLnk~vbtyp_v = c_Delivery 
                inner join Likp  on Likp~Vbeln          = DeliveryLnk~Vbelv 
          where vbrk~vbeln = pu_Vbeln.
    <i><b>This code locates sales, delivery and payment terms info from a billing document number.</b></i> 
    <i><b>or</b></i>
    <b>
    Here, this one also works fine :</b>
    select zfpcd~cadivi zfpcd~proforma zfpcd~factura zfpcd~aniofactura 
    zfpcd~montousd zfpcd~montoap zfpcd~ebeln zfpcd~inco1 
    zfpcd~lifnr lfa1~name1 zcdvs~status zfpcd~conint 
    into it_lista 
    from zfpcd inner join zcdvs 
    on zfpcd~ebeln = zcdvs~ebeln 
    and zfpcd~proforma = zcdvs~proforma 
    and zfpcd~lifnr = zcdvs~lifnr 
    inner join lfa1 
    on zfpcd~lifnr = lfa1~lifnr 
    where zcdvs~status = '04'.
    Reward if helpfull
    Regards
    Pavan

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