Mega Code Archive

 

Categories / Oracle PLSQL / Hierarchical Query

 

Sys_connect_by_path function

SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,   2                    ENAME VARCHAR2(10),   3                    JOB VARCHAR2(9),   4                    MGR NUMBER(4),   5                    HIREDATE DATE,   6                    SAL NUMBER(7, 2),   7                    COMM NUMBER(7, 2),   8                    DEPTNO NUMBER(2)); Table created. SQL> SQL> INSERT INTO EMP VALUES (7369, 'SMITH', 'CLERK',    7902, TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7499, 'ALLEN', 'SALESMAN', 7698, TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7521, 'WARD',  'SALESMAN', 7698, TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7566, 'JONES', 'MANAGER',  7839, TO_DATE('2-APR-1981',  'DD-MON-YYYY'), 2975, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7698, 'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7782, 'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10); 1 row created. SQL> INSERT INTO EMP VALUES (7788, 'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7839, 'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10); 1 row created. SQL> INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7876, 'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7900, 'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7902, 'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7934, 'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10); 1 row created. SQL> SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) ); Table created. SQL> SQL> INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK'); 1 row created. SQL> INSERT INTO DEPT VALUES (20, 'RESEARCH', 'DALLAS'); 1 row created. SQL> INSERT INTO DEPT VALUES (30, 'SALES', 'CHICAGO'); 1 row created. SQL> INSERT INTO DEPT VALUES (40, 'OPERATIONS', 'BOSTON'); 1 row created. SQL> SQL> SQL> select lpad( ' ', (level-1)*2, ' ' ) || ename ename,   2              sys_connect_by_path( ename, '-' ) path   3         from emp   4        start with mgr is null   5      connect by prior empno = mgr   6      / ENAME ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PATH ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ KING -KING   JONES -KING-JONES     SCOTT -KING-JONES-SCOTT ENAME ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PATH ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------       ADAMS -KING-JONES-SCOTT-ADAMS     FORD -KING-JONES-FORD       SMITH -KING-JONES-FORD-SMITH ENAME ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PATH ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------   BLAKE -KING-BLAKE     ALLEN -KING-BLAKE-ALLEN     WARD -KING-BLAKE-WARD ENAME ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PATH ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------     MARTIN -KING-BLAKE-MARTIN     TURNER -KING-BLAKE-TURNER     JAMES -KING-BLAKE-JAMES ENAME ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PATH ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------   CLARK -KING-CLARK     MILLER -KING-CLARK-MILLER 14 rows selected. SQL> SQL> drop table emp cascade constraints; Table dropped. SQL> drop table dept cascade constraints; Table dropped.