111 lines
2.2 KiB
Markdown
111 lines
2.2 KiB
Markdown
# Database Queries for Assignment-A7
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## Creating tables
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`O_RollCall` table:
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```sql
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CREATE TABLE O_RollCall(
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name VARCHAR(255),
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roll NUMBER(14),
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class VARCHAR(255)
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);
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```
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`N_RollCall` table:
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```sql
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CREATE TABLE N_RollCall(
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name VARCHAR(255),
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roll NUMBER(14),
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class VARCHAR(255)
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);
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```
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## Inserting data
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`O_RollCall` table:
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```sql
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INSERT INTO O_RollCall VALUES ('Stewie', 1, 'Comp 1');
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INSERT INTO O_RollCall VALUES ('Edie', 2, 'Comp 2');
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INSERT INTO O_RollCall VALUES ('Stomp', 3, 'Comp 3');
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INSERT INTO O_RollCall VALUES ('Lara', 4, 'Comp 1');
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INSERT INTO O_RollCall VALUES ('Foxy', 5, 'Comp 2');
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```
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`N_RollCall` table:
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```sql
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INSERT INTO N_RollCall VALUES ('Stewie', 1, 'Comp 1');
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INSERT INTO N_RollCall VALUES ('Edie', 2, 'Comp 2');
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INSERT INTO N_RollCall VALUES ('Stomp', 3, 'Comp 3');
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INSERT INTO N_RollCall VALUES ('Lara', 4, 'Comp 1');
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INSERT INTO N_RollCall VALUES ('Foxy', 5, 'Comp 2');
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INSERT INTO N_RollCall VALUES ('Gundeti', 6, 'Comp 3');
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INSERT INTO N_RollCall VALUES ('Kalas', 7, 'Comp 2');
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```
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## Procedure
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### Explicit cursor
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```sql
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DECLARE
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p_name VARCHAR(255);
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p_rollno NUMBER(15);
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p_class VARCHAR(255);
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CURSOR cc1 IS SELECT * FROM N_RollCall WHERE roll NOT IN (SELECT roll FROM O_RollCall);
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BEGIN
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OPEN cc1;
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LOOP
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FETCH cc1 INTO p_name, p_rollno, p_class;
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INSERT INTO O_RollCall VALUES (p_name, p_rollno, p_class);
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EXIT WHEN cc1%notfound;
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DBMS_OUTPUT.PUT_LINE(p_name || ' ' || p_rollno || ' ' || p_class);
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END LOOP;
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CLOSE cc1;
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END;
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/
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```
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### Parameterized cursor
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```sql
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DECLARE
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p_name VARCHAR(255);
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p_rollno NUMBER(15);
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p_class VARCHAR(255);
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CURSOR pp1(roll1 NUMBER) IS SELECT * FROM N_RollCall WHERE roll > roll1;
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BEGIN
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OPEN pp1(3);
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LOOP
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FETCH pp1 INTO p_name, p_rollno, p_class;
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EXIT WHEN pp1%notfound;
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DBMS_OUTPUT.PUT_LINE(p_name || ' ' || p_rollno || ' ' || p_class);
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END LOOP;
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CLOSE pp1;
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END;
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/
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```
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### Implicit Cursor
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```sql
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DECLARE
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total_rows NUMBER(2);
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BEGIN
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UPDATE N_RollCall SET roll = roll + 1;
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IF sql%notfound THEN
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dbms_output.put_line('no roll was updated');
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ELSIF sql%found THEN
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total_rows := sql%rowcount;
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DBMS_OUTPUT.PUT_LINE( total_rows || ' roll calls were affected ');
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END IF;
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END;
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/
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```
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