#CONNECT BY LOOP IN USER DATA HOW TO#

#CONNECT BY LOOP IN USER DATA HOW TO#

Now we add NOCYCLE so that Oracle wonвЂ™t try to represent the infinite loop, and CONNECT_BY_ISCYCLE to show what element (in our case Kenneth) has an ancestor that is the same as a child. This technical note describes the cause of the ORA-01436: CONNECT BY loop in user data error and how to handle it. Now we create a loop by setting it up so Jack works for Kenneth: select LPAD(' ',4(LEVEL-1)) ENAME ENAME from scott. The NOCYCLE parameter instructs Oracle Database to return rows from a query even if a CONNECT BY loop exists in the data. SYS_CONNECT_BY_PATH(a.employee_name,вЂ™/вЂ™) employee_path,Д¬ONNECT BY PRIOR a.employee_id = a.supervisor_employee_id INSERT INTO employee (employee_id, employee_name, supervisor_employee_id) More info can be found here in the Oracle docs. ClearCollect(Loop,RenameColumns(For. The CONNECT_BY_ISCYCLE pseudocolumn returns 1 if the current row has a child which is also its ancestor. To find out where the loop occurs, you can use the CONNECT_BY_ISCYCLE pseudocolumn to find out which row is the problem. This can be generated by the Oracle Database when running any Oracle. When using the CONNECT BY, if the data is in a loop youвЂ™ll get ORA-01436: CONNECT BY loop in user data. This is an Oracle Database Server Message.

Connect by loop in user data