Practical/Assignment-A6/Queries-A6.md

@@ -1,108 +0,0 @@
-## Creating tables
-
-`O_RollCall` table:
-```sql
-CREATE TABLE O_RollCall(
-name VARCHAR(255),
-roll NUMBER(14),
-class VARCHAR(255)
-);
-
-```
-
-`N_RollCall` table:
-```sql
-CREATE TABLE N_RollCall(
-name VARCHAR(255),
-roll NUMBER(14),
-class VARCHAR(255)
-);
-
-```
-
-## Inserting data
-
-`O_RollCall` table:
-```sql
-INSERT INTO O_RollCall VALUES ('Stewie', 1, 'Comp 1');
-INSERT INTO O_RollCall VALUES ('Edie', 2, 'Comp 2');
-INSERT INTO O_RollCall VALUES ('Stomp', 3, 'Comp 3');
-INSERT INTO O_RollCall VALUES ('Lara', 4, 'Comp 1');
-INSERT INTO O_RollCall VALUES ('Foxy', 5, 'Comp 2');
-
-```
-
-`N_RollCall` table:
-```sql
-INSERT INTO N_RollCall VALUES ('Stewie', 1, 'Comp 1');
-INSERT INTO N_RollCall VALUES ('Edie', 2, 'Comp 2');
-INSERT INTO N_RollCall VALUES ('Stomp', 3, 'Comp 3');
-INSERT INTO N_RollCall VALUES ('Lara', 4, 'Comp 1');
-INSERT INTO N_RollCall VALUES ('Foxy', 5, 'Comp 2');
-INSERT INTO N_RollCall VALUES ('Gundeti', 6, 'Comp 3');
-INSERT INTO N_RollCall VALUES ('Kalas', 7, 'Comp 2');
-
-```
-
-## Procedure
-
-### Explicit cursor
-```sql
-DECLARE
-  p_name VARCHAR(255);
-  p_rollno NUMBER(15);
-  p_class VARCHAR(255);
-  CURSOR cc1 IS SELECT * FROM N_RollCall WHERE roll NOT IN (SELECT roll FROM O_RollCall);
-BEGIN
-  OPEN cc1;
-    LOOP
-      FETCH cc1 INTO p_name, p_rollno, p_class;
-      INSERT INTO O_RollCall VALUES (p_name, p_rollno, p_class);
-      EXIT WHEN cc1%notfound;
-      DBMS_OUTPUT.PUT_LINE(p_name || ' ' || p_rollno || ' ' || p_class);
-      END LOOP;
-  CLOSE cc1;
-END;
-/
-
-```
-
-### Parameterized cursor
-```sql
-DECLARE
-  p_name VARCHAR(255);
-  p_rollno NUMBER(15);
-  p_class VARCHAR(255);
-  CURSOR pp1(roll1 NUMBER) IS SELECT * FROM N_RollCall WHERE roll > roll1;
-
-BEGIN
-  OPEN pp1(3);
-    LOOP
-      FETCH pp1 INTO p_name, p_rollno, p_class;
-      EXIT WHEN pp1%notfound;
-      DBMS_OUTPUT.PUT_LINE(p_name || ' ' || p_rollno || ' ' || p_class);
-    END LOOP;
-  CLOSE pp1;
-
-END;
-/
-
-```
-
-### Implicit Cursor
-```sql
-DECLARE
-  total_rows NUMBER(2);
-
-BEGIN
-  UPDATE N_RollCall SET roll = roll + 1;
-  IF sql%notfound THEN
-    dbms_output.put_line('no roll was updated');
-  ELSIF sql%found THEN
-    total_rows := sql%rowcount;
-    DBMS_OUTPUT.PUT_LINE( total_rows || ' roll calls were affected ');
-  END IF;
-END;
-/
-
-```