DECODE does not work in the WHERE clause when subquery returns more than one line

Hi gurus,

I want to write a query against the table CCENTERS (Script given below) and wait for the following result:

1. in the transition from a value of 0 for the ID, it returns all the rows in the table.
2. in the passage of one value other than 0, it returns the row corresponding to the given value and all its records of the child.

CCENTER has parent-child relationship in the column ID and the BASE. I use a query with the DECODE function. but the function in the WHERE clause is not capable of managing the subquery with multiple lines of DECODE.

*************************************************
VARIABLE ParaCCenter NUMBER

BEGIN
: paraccenter: = 0;
END;
/

CREATE TABLE ccenters
(id NUMBER,
name VARCHAR2 (20).
number base);

INSERT INTO ccenters VALUES(1,'NUST',null);
INSERT INTO ccenters VALUES(2,'SEECS',1);
INSERT INTO ccenters VALUES(3,'NBS',1);
commit;

SELECT * from ccenters
WHERE id IN DECODE(:ParaCCenter, 0, id,)
(SELECT id FROM ccenters
START WITH basic =: ParaCCenter
ID of CONNECTION BY PRIOR = base
UNION
SELECT: ParaCCenter OF double
)
)
/
BEGIN
: paraCCenter: = 1;
END;
/

SELECT * from ccenters
WHERE id IN DECODE(:ParaCCenter, 0, id,)
(SELECT id FROM ccenters
START WITH basic =: ParaCCenter
ID of CONNECTION BY PRIOR = base
UNION
SELECT: ParaCCenter double))
/
The result is
(SELECT id FROM ccenters
*
ERROR at line 3:
ORA-01427: einreihig subquery returns multiple rows

How this query can be rewritten for the given feature. Any response will be appreciated.

Thank you

Try something like this:

SELECT * FROM ccenters
WHERE :ParaCCenter = 0
OR id in
  (SELECT id FROM ccenters
   START WITH base=:ParaCCenter
   CONNECT BY PRIOR id = base
   UNION
   SELECT :ParaCCenter FROM dual
  )

Tags: Database

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