Any approach other than the use of a function

Hello

I use Oracle 10.2.0.4.0 version

Create tabel
CREATE TABLE TEST
(  GROUP_NUM        CHAR(8 BYTE),
   DIVISION_NUM     CHAR(5 BYTE),
   DIVNAME          CHAR(40 BYTE));
Insert a table
  insert into test (GROUP_NUM,DIVISION_NUM,DIVNAME) values ('123','0001','deltatrans');
  insert into test  (GROUP_NUM,DIVISION_NUM,DIVNAME) values ('123','0002','deltatrans1');
  insert into test  (GROUP_NUM,DIVISION_NUM,DIVNAME) values ('123','0003','deltatrans3');
  insert into test  (GROUP_NUM,DIVISION_NUM,DIVNAME) values ('456','0001','transatlan');
  insert into test  (GROUP_NUM,DIVISION_NUM,DIVNAME) values ('456','0002','transatlan1');
  insert into test  (GROUP_NUM,DIVISION_NUM,DIVNAME) values ('456','0003','transatlan2');
Select * from test
group_num division_num  divname
123          0001      deltatrans                              
123          0002      deltatrans1                             
123          0003      deltatrans3                             
456          0001      transatlan                              
456          0002      transatlan1                             
456          0003      transatlan2                            
I need the output voltage
group_num  division_num   divname                                       grpname
123          0001      deltatrans                                   deltatrans                              
123          0002      deltatrans1                                  deltatrans                              
123          0003      deltatrans3                                  deltatrans                              
456          0001      transatlan                                   transatlan                              
456          0002      transatlan1                                  transatlan                              
456          0003      transatlan2                                  transatlan             
The grpname column should display the value in the divname column where the divison_num is the minimum for this group.

Currently I use a function to do

Function:
CREATE OR REPLACE FUNCTION
                                fn_testgpname (
                       GPNO IN VARCHAR2  )
    RETURN  varchar2
    AS
RESULT varchar2(40);
BEGIN
select divname into result  from test
where group_num = gpno
and division_num = (select min(division_num) from test where group_num = gpno);
RETURN RESULT;
EXCEPTION WHEN NO_DATA_FOUND THEN
        DBMS_OUTPUT.PUT_LINE (SQLERRM);
          DBMS_OUTPUT.PUT_LINE (RESULT);
          RETURN NULL;
          WHEN OTHERS THEN
          DBMS_OUTPUT.PUT_LINE (SQLERRM);
          DBMS_OUTPUT.PUT_LINE (RESULT);
          RETURN NULL;
END;
/
I'm going to call the function in the qry as
SELECT GROUP_NUM,DIVISION_NUM,DIVNAME,fn_testgpname(group_num) grpname FROM TEST
Also, I noticed when I create a table with the above statement as
create table testing as SELECT GROUP_NUM,DIVISION_NUM,DIVNAME,fn_testgpname(group_num)grpname FROM TEST
the structure of the table is like this
CREATE TABLE TESTING
(
  GROUP_NUM     CHAR(8 BYTE),
  DIVISION_NUM  CHAR(5 BYTE),
  DIVNAME       CHAR(40 BYTE),
  GRPNAME       VARCHAR2(4000 BYTE)
)
Why did the grpname returned as varchar2 (4000 byte)?


Thanks in advance.

My response above.

>
The reason why your table is created with varchar2 (4000), it's that your function returns a varchar2. If oracle picksup default maximum limits for varchar2 and creates the column.

Limit Max for varchar2 is 4000.

>

The reason why he picks up the maximum limit is that... Your function can return a string up to 4000 bytes. Thus, it creates the column with 4000.

If you want with 40 even you can convert,

CREATE TABLE test1 AS
SELECT group_num,
       division_num,
       divname,
       CAST(first_value (divname) OVER (PARTITION BY group_num ORDER BY division_num) AS char(40)) AS grpname
  FROM TEST;

G.

Tags: Database

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