Duplicates in hierarchical query results

Please use the suite of applications:

CREATE TABLE EMP

(NUMBER OF EMP_ID,

EMP_NAME VARCHAR2 (50).

NUMBER OF MANAGER_ID

);

INSERT INTO EMP VALUES(1,'SCOTT',);

INSERT INTO EMP VALUES(2,'JOHN',1);

INSERT INTO EMP VALUES(3,'ROB',2);

INSERT INTO EMP VALUES(4,'MIKE',2);

INSERT INTO EMP VALUES(5,'BOB',);

INSERT INTO EMP VALUES(6,'JEFF',5);

COMMIT;

SELECT * FROM EMP, (SELECT EMP_ID FROM EMP WHERE EMP_ID IN (1.5)) TEMP

START BY EMP. EMP_ID = TEMP. EMP_ID

CONNECT BY PRIOR EMP. EMP_ID = EMP. MANAGER_ID;

Basically, I first spend a few emp_ids a subquery and then want to see all records in the table emp which are direct or indirect of those emp_ids children.

But I get a lot of duplicate records. Can someone explain what is the reason behind this? I can use SEPARATE and spend, but there could be a problem with my request in the first place.

Help, please!

Thank you

RN

Hello

RN says:

Please use the suite of applications:

CREATE TABLE EMP

(NUMBER OF EMP_ID,

EMP_NAME VARCHAR2 (50).

NUMBER OF MANAGER_ID

);

INSERT INTO EMP VALUES(1,'SCOTT',);

INSERT INTO EMP VALUES(2,'JOHN',1);

INSERT INTO EMP VALUES(3,'ROB',2);

INSERT INTO EMP VALUES(4,'MIKE',2);

INSERT INTO EMP VALUES(5,'BOB',);

INSERT INTO EMP VALUES(6,'JEFF',5);

COMMIT;

SELECT * FROM EMP, (SELECT EMP_ID FROM EMP WHERE EMP_ID IN (1.5)) TEMP

START BY EMP. EMP_ID = TEMP. EMP_ID

CONNECT BY PRIOR EMP. EMP_ID = EMP. MANAGER_ID;

Basically, I first spend a few emp_ids a subquery and then want to see all records in the table emp which are direct or indirect of those emp_ids children.

But I get a lot of duplicate records. Can someone explain what is the reason behind this? I can use SEPARATE and spend, but there could be a problem with my request in the first place.

Help, please!

Thank you

RN

Thanks for posting the CREATE TABLE and INSERT statements; It is very useful.

When you do CONNECT BY and joins in the same query (sub-), joins are made first, and then CONNECT BY is performed on all results of the joints.  In this example, you make a cross of PMCs and this join called temp.  Let's see what the result set looks like:

SELECT *.

WCP

,       (

SELECT emp_ID

WCP

WHERE emp_id IN (1.5)

) temp

;

Output:

EMP_ID, EMP_NAME MANAGER_ID EMP_ID

---------- ---------- ---------- ----------

1 SCOTT 1

2 1 1 JOHN

3 ROB                 2          1

4 1 2 MIKE

5 BOB                            1

JEFF 6 5 1

1 SCOTT 5

2 1 5 JOHN

3 ROB                 2          5

4 2 5 MIKE

5 BOB                            5

6 5 5 JEFF

Now, you do a CONNECT BY query on the result set.  As you can see, there are 2 lines with emp_id = 2 in the set of results above, which explains why there are 2 lines in your query results with emp_id = 2.  Similarly, the output defined above, there are 2 lines with emp_id = 3, and they all have two manager_id = 2, each of them is considered to be a child of each of each of the 2 rows with emp_id = 2, and therefore, you have 2 * 2 = 4 lines with emp_id = 3 in the output CONNECT BY.

What is a cross here join?  Why must you temp?  Why not just a CONNECT BY questioning one emp, like this:

SELECT *.

WCP

START WITH emp_id IN (1, 5)

CONNECT BY PRIOR Emp_id = manager_id

;

?

Tags: Database

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    Ernst                                 104                                   103             4

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    Mebu wrote:

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    John

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    Select 'ABC1' System_Id, region 'US', 'CHI' Sub_Region, 4000 balance, To_Date('1-JUN-2012 10:45:00 am', 'dd-mon-yyyy hh:mi:ss am') Last_Upd_Time, 'A' flag of double Union All

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    Select 'ABC1', 'US', 'NY', 3200, To_Date('1-OCT-2012 06:45:00 am', 'dd-mon-yyyy hh:mi:ss am'), has ' starting from dual Union All

    Select "LMN3", "UK", "BT", 2400, To_Date('1-NOV-2012 07:45:00 am', 'dd-mon-yyyy hh:mi:ss am'), has ' From Dual

    )

    Select System_Id, region, Sub_Region, Balance, Last_Upd_Time of Tbl_Nm T1

    where t1. Last_Upd_Time = (select max (Last_Upd_Time) in the Tbl_Nm T2 where T1.) SYSTEM_ID = T2. SYSTEM_ID)

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    to get the Ds at the end of the list.

    or

    ORDER BY CASE WHAT flag = has ' (your other filters) AND then 9 or 1 end CSA,...

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