Hierarchical queries and nested tables
Hallo,
Assume you have the following data structure:
SQL> desc mgr
Name Null? Typ
MGRNO NUMBER
LASTNAME VARCHAR2(20)
EMPS EMPTYPE_TAB
SQL> desc emptype_tab
emptype_tab TABLE OF EMP_TYPE
Name Null? Typ
EMPNO NUMBER
LASTNAME VARCHAR2(20)
I would like to select rows in a hierarchical order to get an output like this:
LAST_NAME EMPNO MGRNO LEVEL
King 100 1
Cambrault 148 100 2
Bates 172 148 3
..but i have absolutely no clue how to use the hierarchical query clause with a nested table.
can anybody help me?
scott@ORA92> CREATE OR REPLACE TYPE emp_type AS OBJECT
2 (empno NUMBER,
3 lastname VARCHAR2(20))
4 /
Type created.
scott@ORA92> CREATE OR REPLACE TYPE emptype_tab AS TABLE OF emp_type
2 /
Type created.
scott@ORA92> CREATE TABLE mgr
2 (MGRNO NUMBER,
3 LASTNAME VARCHAR2(20),
4 EMPS EMPTYPE_TAB)
5 NESTED TABLE emps STORE AS emps_nt
6 /
Table created.
scott@ORA92> INSERT INTO mgr VALUES (NULL, NULL, emptype_tab (emp_type (100, 'King')))
2 /
1 row created.
scott@ORA92> INSERT INTO mgr VALUES (100, 'King', emptype_tab (emp_type (148, 'Cambrault')))
2 /
1 row created.
scott@ORA92> INSERT INTO mgr VALUES (148, 'Cambrault', emptype_tab (emp_type (172, 'Bates')))
2 /
1 row created.
scott@ORA92> SELECT * FROM mgr
2 /
MGRNO LASTNAME
EMPS(EMPNO, LASTNAME)
EMPTYPE_TAB(EMP_TYPE(100, 'King'))
100 King
EMPTYPE_TAB(EMP_TYPE(148, 'Cambrault'))
148 Cambrault
EMPTYPE_TAB(EMP_TYPE(172, 'Bates'))
scott@ORA92> SELECT m.mgrno, m.lastname as mgr, e.empno, e.lastname as emp
2 FROM mgr m, TABLE (emps) e
3 /
MGRNO MGR EMPNO EMP
100 King
100 King 148 Cambrault
148 Cambrault 172 Bates
scott@ORA92> SELECT lastname, empno, mgrno, LEVEL
2 FROM (SELECT m.mgrno, e.lastname, e.empno
3 FROM mgr m, TABLE (emps) e)
4 START WITH mgrno IS NULL
5 CONNECT BY PRIOR empno = mgrno
6 /
LASTNAME EMPNO MGRNO LEVEL
King 100 1
Cambrault 148 100 2
Bates 172 148 3
scott@ORA92>
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Message was edited by:
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and
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What is the rationale for having a referential integrity constraint on a table that has rows bound by hierarchical relationships ?? The hierarchical relationship ensures that each row is referencing another in the same table via the PRIOR clause. If I add a foreign key relationship to these columns , does it make any sense ??/
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10 ....
I use Oracle 8.1.7.4 with Oracle XDK v9.2.0.5.0.
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the signature and signature_bkp have the same structure
So, can anybody help me out to solve this issue :
for copying records from one table to another table
Thanking You advancely
DECLARE
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OR i just want to know ....how to correct the block of code that was given in my 1st msg without changing its logic.
Thanks
--DKar
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