drop table conditionally for help where is?

Hi all

Not sure if I'm doing this right. My SQL is to identify the files that I want to delete properly, when I do manual QC, but I don't know how to delete records identified off the Table.

The table I want to remove on a lot of columns, but when a condition is fulfilled on the 2 posts I'm looking on, I want to delete the rest of the columns, regardless of what they are.

When the combination of the two columns CUST_ID and MIN (STAMP_DATE) exists, then delete this line, or maybe I'm not quite do this right. Basically, there are 2 lines (duplicate for each cust_id) and I want to delete lines with the oldest Date, that's why I use MIN (DATE) Date_field and keep the Max (Date) for the remaining fields.

Thanks for help in advance.
DELETE FROM Table_A
WHERE EXISTS

(
 
SELECT CUST_ID, MIN(STAMP_DATE) as MIN_DATE
FROM
(

SELECT CUST_ID, STAMP_DATE
FROM 
(
    SELECT T1.*, COUNT(*) OVER ( PARTITION BY CUST_ID ) X
    FROM Table_A T1
    WHERE SALES_PERSON is null
)
WHERE X > 1

ORDER BY CUST_ID)
Group by CUST_ID
);

Hello

Whenever you have a problem, please post a small example of data (CREATE TABLE and only relevant columns, INSERT statements) of all the tables.
Also post the results you want from this data, as well as an explanation of how you get these results from these data, with specific examples.
If you ask on a DML, such as DELETE statement, CREATE TABLE and INSERT statements need to re - create the tables as they are before the DML, and results will be the content of the or the tables changed when it's all over.
Always tell what version of Oracle you are using.

Kodiak_Seattle wrote:
Hi all

Not sure if I'm doing this right. My SQL is to identify the files that I want to delete properly, when I do manual QC, but I don't know how to delete records identified off the Table.

If you have a query that displays correctly the lines you want to REMOVE? The request message. If it is worth mentioning at all, display it.

The table I want to remove on a lot of columns, but when a condition is fulfilled on the 2 posts I'm looking on, I want to delete the rest of the columns, regardless of what they are.

DELETE means delete a row in a table. All rows have the same number of columns. There is no way to delete only some columns in a row. You can delete the entire line. Changing values on an existing line is called update, do not REMOVE, even if you are chaning the columns to NULL.
You can, however, some of the columns set to NULL and leaving the other intact columns. Is that what you want? It would really help if you posted an example.

When the combination of the two columns CUST_ID and MIN (STAMP_DATE) exists, then delete this line, or maybe I'm not quite do this right. Basically, there are 2 lines (duplicate for each cust_id) and I want to delete lines with the oldest Date, that's why I use MIN (DATE) Date_field and keep the Max (Date) for the remaining fields.

When you say 'field', do you mean "column?
What do you mean by "keep the Max (Date) for the rest fields? Are you talking about an UPDATE? All other dates columns, and you want to make all equal to stamp_date? It would really help if you posted an example.

Thanks for help in advance.

DELETE FROM Table_A
WHERE EXISTS

(

SELECT CUST_ID, MIN(STAMP_DATE) as MIN_DATE
FROM
(

SELECT CUST_ID, STAMP_DATE
FROM
(
SELECT T1.*, COUNT(*) OVER ( PARTITION BY CUST_ID ) X
FROM Table_A T1
WHERE SALES_PERSON is null
)
WHERE X > 1

ORDER BY CUST_ID)
Group by CUST_ID
);

I think what you want is:

DELETE FROM table_a
WHERE   (cust_id, stamp_date)     IN ( SELECT  cust_id
                                   ,       MIN (stamp_date)
                           FROM    table_a
                         )
;

This assumes that the combination (cust_id, stamp_date) is unique. If it is not (for example, if you have 2 or more lines for the same cust_id, and all have the same exact stamp_date), then you need something a little more complicated.

Tags: Database

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    strSQLGenisys: = "UPDATE MDM_COUNTRY_MAPPING SET | GenisysModify | ', DAT_MODIFY_DATE = SYSDATE, DAT_MODIFIED_BY =' | '''' || Modified_By | '''' || "WHERE MDM_CODE =' | ' Mdm_Code | "and SYSTEM_CODE = 3';

    EXECUTE IMMEDIATE strSQLGenisys;

    END IF;



    END IF;



    EXCEPTION
    WHEN NO_DATA_FOUND THEN
    NULL;
    WHILE OTHERS THEN
    -Consider recording the error and then re-raise
    LIFT;
    END proc_MDM_InsertCntryDetails;
    /


    Thank you

    >
    WHERE mdm_code = mdm_code
    >

    This will always be value true - similar to WHERE 1 = 1.

    You typed it wrong or is the same as the variable column name? If they are the same test rename one of them.

  • open cursor and drop table

    Hello

    How does this work?

    Session 1: Session 2:


    SQL > create table t (x number);

    Table created.

    SQL > insert into t values (1);

    1 line of creation.

    SQL > insert into t values (2);

    1 line of creation.

    SQL > commit;

    Validation complete.

    SQL > start

    2 for f in (select * from t) loop

    3 dbms_output.put_line(sysdate||) e '|| f.x);

    4 dbms_lock.sleep (60);

    5 end of loop;

    6 end;

    7.


    SQL > drop table t;

    Deleted table.

    SQL > select sysdate to double;

    13:58:45

    13:58:34 1

    13:59:34 2


    The table has been deleted, but the line is always returned once the table is deleted. With the help of OPEN and FETCH has the same


    declare
    cursor c is select * from t;
    r t % rowtype;
    Start
    Open c;
    extract the c in r;
    dbms_output.put_line(sysdate||) e '|| r.x);
    DBMS_LOCK. Sleep (60);
    extract the c in r;
    dbms_output.put_line(sysdate||) e '|| r.x);
    end;
    /

    Is this a bug? I could even reproduce it with 1 million rows. Shouldn't this ORA-01001 invalid cursor return?


    Start
    for f in (select * from t) loop
    If f.x in (1,10,100,1000,10000,100000,1000000) then

    dbms_output.put_line(sysdate||) e '|| f.x);

    DBMS_LOCK. Sleep (5);

    end if;
    end loop;
    end;
    /

    Thank you

    Laurent

    PS: It boils down to having no consistency to the DICTIONARY level... which is ugly

    Huh? The dictionary makes perfect sense.

    Any query cursor / who uses the data dictionary will get the correct results.

    If the cursor that you use should the data dictionary, it will get the correct results - he'll notice the table disappeared and will throw an exception.

    Your 'problem' manifests only for a SELECT query. Change the cursor in UPDATES and you can't delete the table.

    SQL > drop table t;

    drop table t

    *

    ERROR on line 1:

    ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired

    Even if you remove a line in this loop.

    https://docs.Oracle.com/CD/B28359_01/server.111/b28318/consist.htm#i8841

    As a request enters the implementation phase, change current system (SNA) number is determined. Figure 13-1, this system change number is 10023. As data blocks are read in the name of the query, only the blocks that are written with the observed SNA are used.

    When the cursor is opened that the SNA is determined, the data file header is read and Oracle knows where the first measure.

    The cursor can read this measure without the need of the data dictionary. So if you drop the table in another session your cursor can continue to read this measure.

    It is ONLY when the next measurement is necessary that Oracle uses the dictionary of data and notice that the table has been deleted.

    https://docs.Oracle.com/CD/B28359_01/server.111/b28318/logical.htm

    A scope is a number of blocks of contiguous data allocated for storing a specific type of information.

    The cursor can keep accessing the measure, and all these "contiguous data blocks" because he knows where the measurement begins and how many blocks there.

    So if 'million' lines fits into this extent (s) the query will keep trucking.

    It may take even more to see the missing table if a path to the index is used as the index blocks are pointers to the previous index block. These pointers can span extensions - you can read an entire table once it has been abandoned if the cursor is using the index to find all data or all the blocks table as long as the extensions/blocks being read have not been replaced or reallocated.

    It is therefore a problem for SOME ONLY.

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