Oracle PL/SQL/PL SQL/Delete Data
Содержание
- 1 Create dynamic delete from command
- 2 Delete a row and output referenced value
- 3 Delete data statement with WHERE clauses.
- 4 Delete employee with stored procedure
- 5 DELETE statement can be used within PL/SQL programs to delete a row or a set of rows
- 6 DELETE statement in PL/SQL block
- 7 Delete statement with variable
- 8 Use procedure to delete departments
Create dynamic delete from command
SQL>
SQL> CREATE or replace PROCEDURE delete_rows (table_name IN VARCHAR2,condition IN VARCHAR2 DEFAULT NULL) AS
2 where_clause VARCHAR2(100) := " WHERE " || condition;
3 BEGIN
4 IF condition IS NULL THEN
5 where_clause := NULL;
6 END IF;
7 EXECUTE IMMEDIATE "DELETE FROM " || table_name || where_clause;
8 END;
9 /
Procedure created.
SQL>
Delete a row and output referenced value
SQL> CREATE TABLE emp (
2 id NUMBER PRIMARY KEY,
3 fname VARCHAR2(50),
4 lname VARCHAR2(50)
5 );
Table created.
SQL>
SQL> INSERT INTO emp (id, fname, lname)VALUES (1, "A", "B");
1 row created.
SQL> INSERT INTO emp (id, fname, lname)VALUES (2, "C", "D");
1 row created.
SQL> INSERT INTO emp (id, fname, lname)VALUES (3, "Enn", "F");
1 row created.
SQL> INSERT INTO emp (id, fname, lname)VALUES (4, "G", "H");
1 row created.
SQL> INSERT INTO emp (id, fname, lname)VALUES (5, "G", "Z");
1 row created.
SQL>
SQL>
SQL> DECLARE
2 v_emp emp%ROWTYPE;
3 BEGIN
4 SELECT * INTO v_emp FROM emp WHERE id = 54;
5
6 DELETE FROM emp WHERE id = v_emp.id;
7
8 DBMS_OUTPUT.PUT_LINE("emp "||v_emp.fname||" "||v_emp.lname||" has been deleted");
9
10 COMMIT;
11
12 EXCEPTION
13 WHEN OTHERS
14 THEN
15 DBMS_OUTPUT.PUT_LINE(SQLERRM);
16 ROLLBACK;
17 END;
18 /
ORA-01403: no data found
PL/SQL procedure successfully completed.
SQL>
SQL> set escape off
SQL>
SQL>
SQL> drop table emp;
Table dropped.
Delete data statement with WHERE clauses.
SQL>
SQL> CREATE TABLE session (
2 department CHAR(3),
3 course NUMBER(3),
4 description VARCHAR2(2000),
5 max_lecturer NUMBER(3),
6 current_lecturer NUMBER(3),
7 num_credits NUMBER(1),
8 room_id NUMBER(5)
9 );
Table created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("HIS", 101, "History 101", 30, 11, 4, 20000);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("HIS", 301, "History 301", 30, 0, 4, 20004);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("CS", 101, "Computer Science 101", 50, 0, 4, 20001);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("ECN", 203, "Economics 203", 15, 0, 3, 20002);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("CS", 102, "Computer Science 102", 35, 3, 4, 20003);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("MUS", 410, "Music 410", 5, 4, 3, 20005);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("ECN", 101, "Economics 101", 50, 0, 4, 20007);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("NUT", 307, "Nutrition 307", 20, 2, 4, 20008);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("MUS", 100, "Music 100", 100, 0, 3, NULL);
1 row created.
SQL>
SQL> select * from session;
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
HIS 101.00
History 101
30.00 11.00 4.00 ########
HIS 301.00
History 301
30.00 .00 4.00 ########
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
CS 101.00
Computer Science 101
50.00 .00 4.00 ########
ECN 203.00
Economics 203
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
15.00 .00 3.00 ########
CS 102.00
Computer Science 102
35.00 3.00 4.00 ########
MUS 410.00
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
Music 410
5.00 4.00 3.00 ########
ECN 101.00
Economics 101
50.00 .00 4.00 ########
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
NUT 307.00
Nutrition 307
20.00 2.00 4.00 ########
MUS 100.00
Music 100
100.00 .00 3.00
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
9 rows selected.
SQL>
SQL> DECLARE
2 v_Department CHAR(3);
3 BEGIN
4 v_Department := "CS";
5 DELETE FROM session
6 WHERE department = v_Department;
7 END;
8 /
PL/SQL procedure successfully completed.
SQL>
SQL> select * from session;
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
HIS 101.00
History 101
30.00 11.00 4.00 ########
HIS 301.00
History 301
30.00 .00 4.00 ########
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
ECN 203.00
Economics 203
15.00 .00 3.00 ########
MUS 410.00
Music 410
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
5.00 4.00 3.00 ########
ECN 101.00
Economics 101
50.00 .00 4.00 ########
NUT 307.00
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
Nutrition 307
20.00 2.00 4.00 ########
MUS 100.00
Music 100
100.00 .00 3.00
7 rows selected.
SQL>
SQL> drop table session;
Table dropped.
SQL>
Delete employee with stored procedure
SQL>
SQL>
SQL>
SQL>
SQL> CREATE TABLE emp
2 (id VARCHAR2(10) NOT NULL,
3 course VARCHAR2(10),
4 year VARCHAR2(4),
5 PRIMARY KEY (id));
Table created.
SQL>
SQL> CREATE OR REPLACE PROCEDURE Delete_emp(delete_id emp.id%TYPE) AS
2
3 BEGIN
4 DELETE FROM emp
5 WHERE id = delete_id;
6 END Delete_emp;
7 /
Procedure created.
SQL> drop table emp;
Table dropped.
DELETE statement can be used within PL/SQL programs to delete a row or a set of rows
SQL> -- create demo table
SQL> 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>
SQL> -- prepare data
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created.
SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
2 /
Hit a key to continue
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer
02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester
03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester
04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager
05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester
06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester
07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager
08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester
8 rows selected.
SQL>
SQL>
SQL> -- DELETE statement can be used within PL/SQL programs to delete a row or a set of rows.
SQL>
SQL>
SQL> BEGIN
2 DELETE FROM employee;
3 END;
4 /
PL/SQL procedure successfully completed.
SQL>
SQL>
SQL> select * from employee;
no rows selected
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
2 /
Table dropped.
SQL>
SQL>
SQL>
DELETE statement in PL/SQL block
SQL>
SQL>
SQL> CREATE TABLE session (
2 department CHAR(3),
3 course NUMBER(3),
4 description VARCHAR2(2000),
5 max_lecturer NUMBER(3),
6 current_lecturer NUMBER(3),
7 num_credits NUMBER(1),
8 room_id NUMBER(5)
9 );
Table created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("HIS", 101, "History 101", 30, 11, 4, 20000);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("HIS", 301, "History 301", 30, 0, 4, 20004);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("CS", 101, "Computer Science 101", 50, 0, 4, 20001);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("ECN", 203, "Economics 203", 15, 0, 3, 20002);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("CS", 102, "Computer Science 102", 35, 3, 4, 20003);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("MUS", 410, "Music 410", 5, 4, 3, 20005);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("ECN", 101, "Economics 101", 50, 0, 4, 20007);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("NUT", 307, "Nutrition 307", 20, 2, 4, 20008);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("MUS", 100, "Music 100", 100, 0, 3, NULL);
1 row created.
SQL>
SQL> CREATE TABLE lecturer (
2 id NUMBER(5) PRIMARY KEY,
3 first_name VARCHAR2(20),
4 last_name VARCHAR2(20),
5 major VARCHAR2(30),
6 current_credits NUMBER(3)
7 );
Table created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10001, "Scott", "Lawson","Computer Science", 11);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major, current_credits)
2 VALUES (10002, "Mar", "Wells","History", 4);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10003, "Jone", "Bliss","Computer Science", 8);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10004, "Man", "Kyte","Economics", 8);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10005, "Pat", "Poll","History", 4);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10006, "Tim", "Viper","History", 4);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10007, "Barbara", "Blues","Economics", 7);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10008, "David", "Large","Music", 4);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10009, "Chris", "Elegant","Nutrition", 8);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10010, "Rose", "Bond","Music", 7);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10011, "Rita", "Johnson","Nutrition", 8);
1 row created.
SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
2 VALUES (10012, "Sharon", "Clear","Computer Science", 3);
1 row created.
SQL>
SQL> select * from lecturer;
ID FIRST_NAME LAST_NAME MAJOR CURRENT_CREDITS
-------- -------------------- -------------------- ------------------------------ ---------------
######## Scott Lawson Computer Science 11.00
######## Mar Wells History 4.00
######## Jone Bliss Computer Science 8.00
######## Man Kyte Economics 8.00
######## Pat Poll History 4.00
######## Tim Viper History 4.00
######## Barbara Blues Economics 7.00
######## David Large Music 4.00
######## Chris Elegant Nutrition 8.00
######## Rose Bond Music 7.00
######## Rita Johnson Nutrition 8.00
ID FIRST_NAME LAST_NAME MAJOR CURRENT_CREDITS
-------- -------------------- -------------------- ------------------------------ ---------------
######## Sharon Clear Computer Science 3.00
12 rows selected.
SQL>
SQL> select * from session;
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
HIS 101.00
History 101
30.00 11.00 4.00 ########
HIS 301.00
History 301
30.00 .00 4.00 ########
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
CS 101.00
Computer Science 101
50.00 .00 4.00 ########
ECN 203.00
Economics 203
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
15.00 .00 3.00 ########
CS 102.00
Computer Science 102
35.00 3.00 4.00 ########
MUS 410.00
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
Music 410
5.00 4.00 3.00 ########
ECN 101.00
Economics 101
50.00 .00 4.00 ########
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
NUT 307.00
Nutrition 307
20.00 2.00 4.00 ########
MUS 100.00
Music 100
100.00 .00 3.00
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
9 rows selected.
SQL>
SQL> DECLARE
2 myLecturerCutoff NUMBER;
3 BEGIN
4 myLecturerCutoff := 10;
5 DELETE FROM session
6 WHERE current_lecturer < myLecturerCutoff;
7
8 DELETE FROM lecturer
9 WHERE current_credits = 0
10 AND major = "Economics";
11 END;
12 /
PL/SQL procedure successfully completed.
SQL>
SQL> select * from lecturer;
ID FIRST_NAME LAST_NAME MAJOR CURRENT_CREDITS
-------- -------------------- -------------------- ------------------------------ ---------------
######## Scott Lawson Computer Science 11.00
######## Mar Wells History 4.00
######## Jone Bliss Computer Science 8.00
######## Man Kyte Economics 8.00
######## Pat Poll History 4.00
######## Tim Viper History 4.00
######## Barbara Blues Economics 7.00
######## David Large Music 4.00
######## Chris Elegant Nutrition 8.00
######## Rose Bond Music 7.00
######## Rita Johnson Nutrition 8.00
ID FIRST_NAME LAST_NAME MAJOR CURRENT_CREDITS
-------- -------------------- -------------------- ------------------------------ ---------------
######## Sharon Clear Computer Science 3.00
12 rows selected.
SQL>
SQL> select * from session;
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
HIS 101.00
History 101
30.00 11.00 4.00 ########
SQL>
SQL> drop table lecturer;
Table dropped.
SQL>
SQL> drop table session;
Table dropped.
SQL>
SQL>
SQL>
Delete statement with variable
SQL>
SQL> CREATE TABLE session (
2 department CHAR(3),
3 course NUMBER(3),
4 description VARCHAR2(2000),
5 max_lecturer NUMBER(3),
6 current_lecturer NUMBER(3),
7 num_credits NUMBER(1),
8 room_id NUMBER(5)
9 );
Table created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("HIS", 101, "History 101", 30, 11, 4, 20000);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("HIS", 301, "History 301", 30, 0, 4, 20004);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("CS", 101, "Computer Science 101", 50, 0, 4, 20001);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("ECN", 203, "Economics 203", 15, 0, 3, 20002);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("CS", 102, "Computer Science 102", 35, 3, 4, 20003);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("MUS", 410, "Music 410", 5, 4, 3, 20005);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("ECN", 101, "Economics 101", 50, 0, 4, 20007);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("NUT", 307, "Nutrition 307", 20, 2, 4, 20008);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ("MUS", 100, "Music 100", 100, 0, 3, NULL);
1 row created.
SQL>
SQL> select * from session;
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
HIS 101.00
History 101
30.00 11.00 4.00 ########
HIS 301.00
History 301
30.00 .00 4.00 ########
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
CS 101.00
Computer Science 101
50.00 .00 4.00 ########
ECN 203.00
Economics 203
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
15.00 .00 3.00 ########
CS 102.00
Computer Science 102
35.00 3.00 4.00 ########
MUS 410.00
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
Music 410
5.00 4.00 3.00 ########
ECN 101.00
Economics 101
50.00 .00 4.00 ########
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
NUT 307.00
Nutrition 307
20.00 2.00 4.00 ########
MUS 100.00
Music 100
100.00 .00 3.00
DEP COURSE
--- --------
DESCRIPTION
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS ROOM_ID
------------ ---------------- ----------- --------
9 rows selected.
SQL>
SQL> DECLARE
2 Department CHAR(3);
3 BEGIN
4 Department := "CS";
5 DELETE FROM session
6 WHERE department = Department;
7 END;
8 /
PL/SQL procedure successfully completed.
SQL>
SQL> select * from session;
no rows selected
SQL>
SQL> drop table session;
Table dropped.
SQL>
SQL>
Use procedure to delete departments
SQL> CREATE TABLE Department (
2 DepartmentID INT NOT NULL PRIMARY KEY,
3 Name VARCHAR(50) NOT NULL,
4 Description VARCHAR(200) NULL);
SQL>
SQL> CREATE SEQUENCE DepartmentIDSeq;
SQL>
SQL> CREATE OR REPLACE TRIGGER DepartmentAutonumberTrigger
2 BEFORE INSERT ON Department
3 FOR EACH ROW
4 BEGIN
5 SELECT DepartmentIDSeq.NEXTVAL
6 INTO :NEW.DepartmentID FROM DUAL;
7 END;
8 /
SQL>
SQL> INSERT INTO Department (Name, Description) VALUES ("Software", "Coding");
SQL> INSERT INTO Department (Name, Description) VALUES ("Hardware", "Building");
SQL> INSERT INTO Department (Name, Description) VALUES ("QA", "Testing");
SQL>
SQL> CREATE TABLE Category (
2 CategoryID INT NOT NULL PRIMARY KEY,
3 DepartmentID INT NOT NULL,
4 Name VARCHAR(50) NOT NULL,
5 Description VARCHAR (200) NULL);
SQL>
SQL> CREATE SEQUENCE CategoryIDSeq;
SQL>
SQL> CREATE OR REPLACE TRIGGER CategoryAutonumberTrigger
2 BEFORE INSERT ON Category
3 FOR EACH ROW
4 BEGIN
5 SELECT CategoryIDSeq.NEXTVAL
6 INTO :NEW.CategoryID FROM DUAL;
7 END;
8 /
SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (1, "Local", "In town");
SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (1, "Remote", "Telecommute");
SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (2, "Masks", "By bits");
SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (3, "Wireless", "Not connected");
SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (3, "Wired", "Connected");
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> CREATE TABLE Product (
2 ProductID INT NOT NULL PRIMARY KEY,
3 Name VARCHAR(50) NOT NULL,
4 Description VARCHAR(1000) NOT NULL,
5 Price NUMBER NULL,
6 ImagePath VARCHAR(50) NULL,
7 soldout NUMBER(1,0) NULL,
8 Promotion NUMBER(1,0) NULL);
SQL>
SQL> CREATE SEQUENCE ProductIDSeq;
SQL>
SQL> CREATE OR REPLACE TRIGGER ProductAutonumberTrigger
2 BEFORE INSERT ON Product
3 FOR EACH ROW
4 BEGIN
5 SELECT ProductIDSeq.NEXTVAL
6 INTO :NEW.ProductID FROM DUAL;
7 END;
8 /
SQL>
SQL> INSERT INTO Product (Name, Description, Price, ImagePath,soldout, Promotion) VALUES ("Pen", "Ball Pen",5.99, "pen.jpg", 1, 0);
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion) VALUES ("Ruler","Long",14.99, "ruler.jpg", 0, 0);
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion) VALUES ("Desk", "Computer Desk",5.99, "desk.jpg", 0, 1);
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion) VALUES ("PC", "Notebook",49.99, "pc.jpg", 0, 1);
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion) VALUES ("Mouse", "Wireless",9.99, "mouse.jpg", 1, 0);
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion) VALUES ("Keyboard","keyboard",3.75, "keyboard.jpg", 0, 0);
SQL>
SQL>
SQL> CREATE TABLE ProductCategory (
2 ProductID INT NOT NULL,
3 CategoryID INT NOT NULL,
4 PRIMARY KEY (ProductID, CategoryID)
5 );
SQL>
SQL>
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (1,3);
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (2,1);
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (2,3);
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (3,3);
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (4,1);
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (5,2);
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (6,3);
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (6,4);
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (7,4);
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (8,5);
SQL>
SQL> CREATE PROCEDURE DeleteDepartment
2 (DeptID IN integer)
3 AS
4 BEGIN
5 DELETE FROM Department
6 WHERE DepartmentID = DeptID
7 AND NOT EXISTS (SELECT Name FROM Category WHERE DepartmentID = DeptID);
8 END;
9 /
SQL>
SQL> drop table department;
SQL> drop sequence DepartmentIDSeq;
SQL> drop table Product;
SQL> drop table ProductCategory;
SQL> drop table Category;
SQL> drop sequence CategoryIDSeq;
SQL> drop sequence ProductIDSeq;