Hierarchical queries - problem with condition "begins by".

Hi people

I play with the connection by and start with clause and am faced with a particular problem which I can not solve...

My data set is:

Create table dates_q
(start_date date,
end_date date)
/

REM INSERTING into dates_q
Insert into dates_q ("START_DATE","END_DATE") values (to_date('01-JAN-14','DD-MON-RR'),to_date('10-JAN-14','DD-MON-RR'));
Insert into dates_q ("START_DATE","END_DATE") values (to_date('11-JAN-14','DD-MON-RR'),to_date('20-JAN-14','DD-MON-RR'));
Insert into dates_q ("START_DATE","END_DATE") values (to_date('10-MAR-14','DD-MON-RR'),to_date('20-MAR-14','DD-MON-RR'));
Insert into dates_q ("START_DATE","END_DATE") values (to_date('21-MAR-14','DD-MON-RR'),to_date('31-MAR-14','DD-MON-RR'));
Insert into dates_q ("START_DATE","END_DATE") values (to_date('01-APR-14','DD-MON-RR'),to_date('10-APR-14','DD-MON-RR'));

Now I basically just want to get your hands on hierarchical queries and working with the syntax of various...

What I now want is, start with the date of April 1 as my start date and work backward to build my 'tree '. The condition of my tree is between two rows; my start and end dates differ from 1 day. If they do not; I don't want these records in my tree.

And using sys_connect_by_path, I want to get all the way from the root.

Thus, for example,.

SELECT a.*,
       sys_connect_by_path(start_date, '|'),
       LEVEL lvl
  FROM dates_q a
 CONNECT BY PRIOR end_date = (start_date - 1)

I get the following output

START_DATE	END_DATE	SYS_CONNECT_BY_PATH(START_DATE,'\|')	LVL
01.01.2014	10.01.2014	\| 1 JANUARY 14	1
11.01.2014	20.01.2014	\| 1 JANUARY 14 \| JANUARY 11, 14	2
11.01.2014	20.01.2014	\| JANUARY 11, 14	1
10.03.2014	20.03.2014	\| MARCH 10, 14	1
21.03.2014	31.03.2014	\| MARCH 10, 14. MARCH 21, 14	2
01.04.2014	10.04.2014	\|10-MAR-14\|21-MAR-14\|01-APR-14	3
21.03.2014	31.03.2014	\| MARCH 21, 14	1
01.04.2014	10.04.2014	\| MARCH 21, 14. 1 APRIL 14	2
01.04.2014	10.04.2014	\| 1 APRIL 14	1

But for the moment I did not have any starting point... Now comes the FUN part...

When I give the State of departure; I get a single row :-(

Example of

SELECT a.*,
       sys_connect_by_path(start_date, '|'),
       LEVEL lvl
  FROM dates_q a
 CONNECT BY PRIOR end_date = (start_date - 1)
 START WITH start_date = To_Date('01-apr-2014','dd-mon-yyyy');

The result is

START_DATE	END_DATE	SYS_CONNECT_BY_PATH(START_DATE,'\|')	LVL
01.04.2014	10.04.2014	\| 1 APRIL 14	1

Just a line...!

I'm unable to understand this and work more and need help.

The formation of the tree works only in a 'sense' and I'm going the other way around? Don't know what it means but just something that comes to mind. :/

Thank you

P.S. - database is 10g R2.

Hello

Thanks for the display of the data of the sample; It is very useful.

What do you expect the result will be and why?

LEVEL = 1 contains all rows that meet the condition to START WITH. The rows that meet the condition

start_date = To_Date('01-apr-2014','dd-mon-yyyy')

in this case? Only the line you actually obtained.

LEVEL = N (where N > 1) contains all rows that meet the conditions regarding some FRONT CONNECT BY rank level = N - 1. Since the only line level = 1 to end_date = To_Date('10-apr-2014','dd-mon-yyyy'), lines satisfy the condition

End_date PRIOR = (start_date - 1).

? None. End_date PREREQUISITE is April 10, while rows with start_date April 11 would fulfill this condition, there is no line on LEVEL = 2 and the query stops there.

You would have expected this from your previous results. The line with the start_date April 1 had no children in the previous application, so there no children in any application that has the same State of CONNECT BY.

Maybe you meant the CONNECT BY condtion to be

End_date = BEFORE (start_date - 1).

Tags: Database

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