Recursive with clause

Question

Hi All,
I am using oracle 11.2.0.4
I m using this for learning purpose
Below is my table and insert statement
CREATE TABLE NUMBERS(NUM NUMBER);
INSERT INTO NUMBERS VALUES(1);
INSERT INTO NUMBERS VALUES(2);
INSERT INTO NUMBERS VALUES(3);
INSERT INTO NUMBERS VALUES(4);
WITH RSFC(ITERATION,RUNNING_FACTORIAL) AS
(SELECT NUM AS ITERATION,
1 AS RUNNING_FACTORIAL
FROM NUMBERS
WHERE NUM=1
UNION ALL
SELECT R.ITERATION+1,
        R.RUNNING_FACTORIAL * B.NUM
        FROM RSFC R INNER JOIN NUMBERS B
        ON (R.ITERATION+1) + B.NUM    
        SELECT ITERATION,RUNNING_FACTORIAL
        FROM RSFC
I am learning recursive with clause
when I am trying to execute the query I am getting
ORA-00920 : invalid realtional operator
what is wrong in this query,please help me
Thanks and Regrds,
Subho

Answer 1

Hi,
2937991 wrote:
Hi All,
I am using oracle 11.2.0.4
I m using this for learning purpose
Below is my table and insert statement
CREATE TABLE NUMBERS(NUM NUMBER);
INSERT INTO NUMBERS VALUES(1);
INSERT INTO NUMBERS VALUES(2);
INSERT INTO NUMBERS VALUES(3);
INSERT INTO NUMBERS VALUES(4);
WITH RSFC(ITERATION,RUNNING_FACTORIAL) AS
(SELECT NUM AS ITERATION,
1 AS RUNNING_FACTORIAL
FROM NUMBERS
WHERE NUM=1
UNION ALL
SELECT R.ITERATION+1,
        R.RUNNING_FACTORIAL * B.NUM
        FROM RSFC R INNER JOIN NUMBERS B
        ON (R.ITERATION+1) + B.NUM   
        SELECT ITERATION,RUNNING_FACTORIAL
        FROM RSFC
I am learning recursive with clause
when I am trying to execute the query I am getting
ORA-00920 : invalid realtional operator
what is wrong in this query,please help me
Thanks and Regrds,
Subho
The error actually has nothing to do with the WITH clause.
Join conditions (that is, the conditions following the ON keyword) must be expressions that evaluate to TRUE or FALSE.  The join condition you posted, however
(R.ITERATION+1) + B.NUM   
evaluates to a NUMBER.  The following would be a valid join condition:
(R.ITERATION+1) = B.NUM  
but I have no idea if that's what you wanted or not.