Database column updates based on 2 fields being equal to two tables

I get an error 1427 when you try to update a field in tables.

I have about 30 000 records in tableA and about 2500 in tableB

I'm trying to update a field in tableA based on equality of the 2 fields in each table.

Update tableA a set a.Col1 =
(select b.Col1 from tableB b where a.Col2 = b.Col2 and a.Col3 = b.Col3);

There are several rows in tableA that should be whether the selection is true.

I think I need to write some PL/SQL, but not sure.

Any ideas?

Thank you
ANON

Anon,

I don't know how to put your data, but you can try a merger in tablea with a distinct subset of tableb.

merge into tablea t
using (select distinct col1, col2, col3 from tableb) s
on (t.col2 = s.col2 and t.col3 = s.col3)
when matched then
update
   set  t.col1 = s.col1
 where  t.col1 != s.col1
    or (t.col1 is null and s.col1 is not null)
    or (t.col1 is not null and s.col1 is null);

Concerning
Peter

Tags: Database

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    {\code}

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    WHERE NVL(oad.act_qty,0) = 0

    ;

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    IN ot_actual_dtl (act_pm_code, act_ps_code, act_qty) VALUES (pm_code, ps_code, ps_qty)

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    (

    SELECT ocd.cut_pm_code,

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    OCD.cut_ps_qty,

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    OCD.cut_ps_code,

    OCD.cut_ps_qty

    ),

    qry2 (pm_code, ps_code, ps_qty, Qty, Flag) AS

    (

    Cut_pm_code SELECT pm_code,

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    1 ps_qty,

    1 qty

    CASE WHEN (q1.act_qty <> q1.cut_ps_qty) THEN the 'ACT' ELSE "ACTP" END flag

    OF qry1 q1

    WHERE q1.act_qty<=>

    AND q1.act_qty <> 0

    AND q1.actp_qty <> 0

    UNION ALL

    SELECT q2.pm_code,

    Q2.ps_code,

    Q2.ps_qty,

    Q2. Qty + 1,

    flag

    OF qry2 q2, q1 qry1

    WHERE q2.pm_code = q1.cut_pm_code

    AND q2.ps_code = cut_ps_code

    AND q2.qty + 1 <= case="" when="" (q1.act_qty=""> <> q1.cut_ps_qty) THEN q1.act_qty ELSE q1.actp_qty END

    )

    SELECT q2.pm_code,

    Q2.ps_code,

    Q2.ps_qty,

    Q2. Flag

    OF qry2 T2

    ;

    You must follow two steps.

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    Step 2:-once the update is finished, insert into table using INSERT ANY State.

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