How to remove duplicates from a Table using PL/SQL
I created the following tables with data:* Table 1: *.
Department of CREATE TABLE
(DEPARTMENT_ID 4 NUMBER PRIMARY KEY,
DEPARTMENT_NAME VARCHAR2 (20).
ADDRESS VARCHAR2 (20));
INSERT INTO Department VALUES (10, 'ACCOUNTING', 'NEW YORK');
INSERT INTO Department VALUES (20, "SEARCH", "DALLAS");
INSERT INTO Department VALUES (30, 'SALES', 'CHICAGO');
INSERT INTO Department VALUES (40, 'OPERATIONS', 'BOSTON');
COMMIT;
* 2nd table: *.
CREATE TABLE employee
(EMPLOYEE_ID NUMBER 4 PRIMARY KEY,
EMPLOYEE_NAME VARCHAR2 (20).
USE VARCHAR2 (20).
MANAGER_ID NUMBER 4,
HIRE_DATE DATE,
NUMBER OF SALARY (9, 2)
COMMISSION (9, 2) NUMBER,
Department_id number 4 REFERENCES department (DEPARTMENT_ID));
INSERT INTO employee
VALUES (7839, 'KING', 'PRESIDENT', NULL, NOVEMBER 17, 81 ', 5000, NULL, 10);
INSERT INTO employee
VALUES (7698, "BLAKE", "MANAGER", 7839, MAY 1, 81 ', 2850, NULL, 30);
INSERT INTO employee
VALUES (7782, "CLARK", "MANAGER", 7839, JUNE 9, 81 ', 2450, NULL, 10);
INSERT INTO employee
VALUES (7566, "JONES", "MANAGER", 7839, APRIL 2, 81 ', 2975, NULL, 20);
INSERT INTO employee
VALUES (7654, 'MARTIN', 'SELLER', 7698, 28-SEP-81', 1250, 1400, 30);
INSERT INTO employee
VALUES (7499, 'ALLEN', 'SELLER', 7698, FEBRUARY 20, 81 ', 1600, 300, 30);
INSERT INTO employee
VALUES (7844, 'TURNER', 'SELLER', 7698, ' 08-SEP-81', 1500, NULL, 30);
INSERT INTO employee
VALUES (7900, 'JAMES', 'CLERKS', 7698, 3 DECEMBER 81', 950, NULL, 30);
INSERT INTO employee
VALUES (7521, 'WARD', 'SELLER', 7698, FEBRUARY 22, 81 ', 1 250, 500, 30);
INSERT INTO employee
VALUES (7902, "FORD", "ANALYST", 7566, DECEMBER 3, 81 ', 3000, NULL, 20);
INSERT INTO employee
VALUES (7369, 'SMITH', 'CLERKS', 7902, DECEMBER 17, 81 ', 800, NULL, 20);
INSERT INTO employee
VALUES (7788, 'SCOTT', 'ANALYST', 7566, DECEMBER 9, 82 ', 3000, NULL, 20);
INSERT INTO employee
VALUES (7876, ' ADAMS, "CLERK", 7788, 12 JANUARY, 83', 1100, NULL, 20);
INSERT INTO employee
VALUES (7934, 'MILLER', 'CLERKS', 7782, JANUARY 22, 82 ', 1300, NULL, 10);
COMMIT;
I need to print all Department names, employee and salary. I did this, but how can display the name of each Department only once?
Here is my code:
DECLARE
v_department_name department.department_name%TYPE;
v_employee_name employee.employee_name%TYPE;
v_salary employee.salary%TYPE;
CURSOR dept_cur
IS
SELECT employee_name, department_name, Department OF employee salary
WHERE department.department_id = employee.department_id (+)
ORDER BY department_name, employee_name;
BEGIN
OPEN dept_cur.
EXTRACT the dept_cur IN v_department_name, v_employee_name, v_salary;
DBMS_OUTPUT. PUT_LINE ('DEPARTMENT_NAME EMPLOYEE_NAME WAGES');
DBMS_OUTPUT. PUT_LINE('---------------------------------------------------');
While dept_cur % FOUND
LOOP
DBMS_OUTPUT. Put_line (RPAD (v_department_name, 10) |) ' ' || RPAD (v_employee_name, 10). ' ' || v_salary);
EXTRACT the dept_cur IN v_department_name, v_employee_name, v_salary;
END LOOP;
CLOSE Dept_cur;
END;
I would appreciate if you could help me with this. I'm sure it's a quick and easy answer, but I can't do it. I spent so much time already.
Published by: 831522 on January 26, 2011 11:44
It is a problem of display/reports rather than a problem of duplication of query data. The answer depends on what tools you use to query and display the data. You can use the clause "break it" I suggested earlier if you use SQL Plus.
Otherwise, you can try this based on the version of Oracle you are using. Someone else may be able to get the data in a single pass.
SELECT decode(emp_id, 1, department_name) department_name, employee_name, salary
FROM(SELECT department_name, employee_name, salary,
ROW_NUMBER() OVER (PARTITION BY department_name order by department_name, employee_name) AS emp_id
FROM department
LEFT OUTER JOIN employee ON (department.department_id = employee.department_id)
ORDER BY department_name, employee_name, emp_id);
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