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' customers selected '); END IF; END; / Select * from customers; ---- ---------- ----- ----------- ---------- | ID | NAME | AGE | ADDRESS | SALARY | ---- ---------- ----- ----------- ---------- | 1 | Ramesh | 32 | Ahmedabad | 2500.00 | | 2 | Khilan | 25 | Delhi | 2000.00 | | 3 | kaushik | 23 | Kota | 2500.00 | | 4 | Chaitali | 25 | Mumbai | 7000.00 | | 5 | Hardik | 27 | Bhopal | 9000.00 | | 6 | Komal | 22 | MP | 5000.00 | ---- ---------- ----- ----------- ---------- Explicit cursors are programmer-defined cursors for gaining more control over the context area.An explicit cursor should be defined in the declaration section of the PL/SQL Block.The PL/SQL is shown in italics: CREATE PROCEDURE remove_emp (employee_id NUMBER) AS tot_emps NUMBER; BEGIN DELETE FROM employees WHERE employees.employee_id = remove_emp.employee_id; tot_emps := tot_emps - 1; END; / The remove_emp procedure removes a specified employee.When you call the procedure, you must specify the employee_id of the employee to be removed.In this chapter, we will discuss the cursors in PL/SQL. A cursor holds the rows (one or more) returned by a SQL statement.Oracle creates a memory area, known as the context area, for processing an SQL statement, which contains all the information needed for processing the statement; for example, the number of rows processed, etc. The set of rows the cursor holds is referred to as the active set.It is created on a SELECT Statement which returns more than one row.

Oracle created PL/SQL that extends some limitations of SQL to provide a more comprehensive solution for building mission-critical applications running on Oracle database.

create table Employee( 2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 / Table created.

SQL CREATE OR REPLACE PROCEDURE update_employee_salary( 2 p_factor IN NUMBER 3 ) AS 4 v_employee_count INTEGER; 5 BEGIN 6 UPDATE employee 7 SET salary = salary * p_factor; 8 COMMIT; 9 EXCEPTION 10 WHEN OTHERS THEN 11 ROLLBACK; 12 END update_employee_salary; 13 / Procedure created.

For INSERT operations, the cursor holds the data that needs to be inserted.

For UPDATE and DELETE operations, the cursor identifies the rows that would be affected.

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