Answer Posted / chandra shekhar

Cursor Types
- Implicit Cursor
- Explicit Cursor (Without parameters, With Parameters)


############################################
##### Implicit Cursor #####################
############################################

-- assuming there is a table emp in the schema
DECLARE
VENAME EMP.ENAME%TYPE ;
BEGIN
SELECT ENAME INTO VENAME FROM EMP WHERE EMPNO = &EMPLOYEENUMBER ;
IF SQL%FOUND THEN
DBMS_OUTPUT.PUT_LINE('EMPLOYEE NAME IS ' || VENAME);
END IF ;
EXCEPTION
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE('NO EMPLOYEE WITH GIVE EMPLOYEE NUMBER ') ;
END ;
/

############################################
##### Explicit Cursor #####################
############################################

-- First method
===============

DECLARE
CURSOR C1 IS SELECT EMPNO, ENAME FROM EMP ;
BEGIN
FOR I IN C1
LOOP
DBMS_OUTPUT.PUT(I.EMPNO);
DBMS_OUTPUT.PUT_LINE(' -- ' || I.ENAME);
END LOOP ;
END ;
/

-- Second method
================

DECLARE
CURSOR C1 IS SELECT EMPNO, ENAME FROM EMP ;
E C1%ROWTYPE ;
BEGIN
OPEN C1 ;
LOOP
FETCH C1 INTO E ;
EXIT WHEN C1%NOTFOUND ;
DBMS_OUTPUT.PUT(E.EMPNO);
DBMS_OUTPUT.PUT_LINE(' -- ' || E.ENAME);
END LOOP ;
CLOSE C1 ;
END ;
/

-- With Parameters
==================

DECLARE
CURSOR C1(n number) IS SELECT EMPNO, ENAME FROM EMP where sal < n;
E C1%ROWTYPE ;
BEGIN
OPEN C1(&salary) ;
loop
FETCH C1 INTO E ;
exit when c1%notfound ;
DBMS_OUTPUT.PUT(E.EMPNO);
DBMS_OUTPUT.PUT_LINE(' -- ' || E.ENAME);
end loop ;
CLOSE C1 ;
END ;
/

Can we create index on primary key?

959

---

What are operators available in sql?

1035

---

How many types of literals are available in pl sql?

1109

---

What are the constraints available in sql?

1041

---

what are the advantages and disadvantages of views in a database? : Sql dba

1037

---

what is the use of friend function? : Sql dba

1015

---

What is pl sql quora?

1137

---

Is big data nosql?

936

---

Are stored procedures compiled?

911

---

how can we destroy the cookie? : Sql dba

1005

---

Can I create table without primary key?

989

---

Can we create table inside stored procedure?

947

---

How much does sqlite cost?

1033

---

Explain the types of joins in sql?

1026

---

how to check myisam tables for errors? : Sql dba

1315

---