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1907031_DDL.sql

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+-- Drop the applications table
+DROP TABLE applications;
+
+-- Drop the jobs table
+DROP TABLE jobs;
+
+-- Drop the users table
+DROP TABLE users;
+
+-- Drop the companies table
+DROP TABLE companies;
+
+-- Create the companies table
+CREATE TABLE companies (
+    company_id INTEGER NOT NULL,
+    company_name VARCHAR(40) NOT NULL,
+    category VARCHAR(40),
+    website VARCHAR(40),
+    ceo_name VARCHAR(40),
+    PRIMARY KEY (company_id)
+);
+
+-- Create the users table
+CREATE TABLE users (
+    user_id INTEGER NOT NULL,
+    user_name VARCHAR(40) NOT NULL,
+    phone NUMBER(15),
+    email VARCHAR(40) UNIQUE NOT NULL,
+    skillset VARCHAR(40),
+    educational_qualification VARCHAR(40),
+    PRIMARY KEY (user_id)
+);
+
+-- Create the jobs table
+CREATE TABLE jobs (
+    job_id INTEGER NOT NULL,
+    job_title VARCHAR(40) NOT NULL,
+    company_id INTEGER NOT NULL,
+    job_type VARCHAR(40) CHECK (job_type IN ('Full Time', 'Part Time', 'Contract', 'Temporary', 'Remote')),
+    salary NUMBER(20),
+    education VARCHAR(40),
+    PRIMARY KEY (job_id),
+    FOREIGN KEY (company_id) REFERENCES companies(company_id)
+    on delete cascade
+);
+
+-- Create the applications table
+CREATE TABLE applications (
+    app_id INTEGER NOT NULL,
+    job_id INTEGER NOT NULL,
+    user_id INTEGER NOT NULL,
+    status VARCHAR(40) CHECK (status IN ('Accepted', 'Rejected', 'Pending')),
+    PRIMARY KEY (app_id),
+    FOREIGN KEY (job_id) REFERENCES jobs(job_id),
+    FOREIGN KEY (user_id) REFERENCES users(user_id)
+    on delete cascade
+);
+
+-- Add column in the table
+ALTER TABLE applications ADD test CHAR(40);
+
+--Modify column definition in the table
+alter table applications modify test varchar(40);
+
+--Rename the column name
+alter table applications rename column test to test2;
+
+--Drop the column from table
+alter table applications drop column test2;

1907031_DML.sql

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+-- Insert data into the companies table
+INSERT INTO companies VALUES(0001, 'Apple', 'Multinational Technology', 'www.apple.com', 'Tim Cook');
+INSERT INTO companies VALUES(0002, 'Google', 'Multinational Technology', 'www.google.com', 'Sundar Pichai');
+INSERT INTO companies VALUES(0003, 'Electronic Arts', 'Video Game', 'www.ea.com', 'Andrew Wilson');
+INSERT INTO companies VALUES(0004, 'Microsoft', 'Multinational Technology', 'www.microsoft.com', 'Sotya Nadella');
+INSERT INTO companies VALUES(0005, 'Tesla', 'Multinational Automotive', 'www.tesla.com', 'Elon Mask');
+INSERT INTO companies VALUES(0006, 'Samsung', 'Multinational Technology', 'www.samsung.com', 'Kim Hyun-suk');
+INSERT INTO companies VALUES(0007, 'Amazon', 'E-commerce', 'www.amazon.com', 'Andy Jassy');
+INSERT INTO companies VALUES(0008, 'Sony', 'Multinational Conglomerate', 'www.sony.com', 'Kenichiro Yoshida');
+INSERT INTO companies VALUES(0009, 'IBM', 'Multinational Technology', 'www.ibm.com', 'Arvind Krishna');
+INSERT INTO companies VALUES(0010, 'Netflix', 'Streaming Media', 'www.netflix.com', 'Reed Hastings');
+
+-- Insert data into the users table
+INSERT INTO users VALUES(1001, 'Naimur Rahman', 01751099887, 'naimur.rahman.rs@gmail.com', 'Game Developer', 'Bsc in CSE');
+INSERT INTO users VALUES(1002, 'Galib', 01759964341, 'galib@gmail.com', 'Software Developer', 'Bsc in SWE');
+INSERT INTO users VALUES(1003, 'Atique Faisal', 01994213076, 'atique@gmail.com', 'Chip Designer', 'Bsc in EEE');
+INSERT INTO users VALUES(1004, 'Enan Emon', 01859964299, 'enan@gmail.com', 'Graphics Designer', 'HSC');
+INSERT INTO users VALUES(1005, 'Yashrif Arifin', 01776809429, 'yashrif@gmail.com', 'Software Developer', 'Bsc in CSE');
+INSERT INTO users VALUES(1006, 'John Smith', 0123456781, 'johnsmith@gmail.com', 'Software Engineer', 'BSc in Computer Science');
+INSERT INTO users VALUES(1007, 'Emma Johnson', 0123456782, 'emmajohnson@gmail.com', 'Data Analyst', 'BSc in Mathematics');
+INSERT INTO users VALUES(1008, 'Michael Brown', 0123456783, 'michaelbrown@gmail.com', 'Web Developer', 'BSc in Information Technology');
+INSERT INTO users VALUES(1009, 'Olivia Davis', 0123456784, 'oliviadavis@gmail.com', 'UI/UX Designer', 'BSc in Multimedia');
+INSERT INTO users VALUES(1010, 'Sophia Wilson', 0123456785, 'sophiawilson@gmail.com', 'Data Scientist', 'BSc in Statistics');
+
+-- Insert data into the jobs table
+INSERT INTO jobs VALUES(2001, 'Software Developer', 0004, 'Full Time', 20000, 'Bsc in SWE');
+INSERT INTO jobs VALUES(2002, 'Game Developer', 0003, 'Part Time', 5000, 'Bsc in CSE');
+INSERT INTO jobs VALUES(2003, 'Graphics Designer', 0002, 'Contract', 2000, 'HSC');
+INSERT INTO jobs VALUES(2004, 'Software Developer', 0001, 'Part Time', 8000, 'Bsc in CSE');
+INSERT INTO jobs VALUES(2005, 'Chip Designer', 0005, 'Full Time', 25000, 'Bsc in EEE');
+INSERT INTO jobs VALUES(2006, 'Software Engineer', 0009, 'Full Time', 50000, 'BSc in Computer Science');
+INSERT INTO jobs VALUES(2007, 'Data Analyst', 0006, 'Part Time', 25000, 'BSc in Mathematics');
+INSERT INTO jobs VALUES(2008, 'Web Developer', 0006, 'Contract', 3000, 'BSc in Information Technology');
+INSERT INTO jobs VALUES(2009, 'UI/UX Designer', 0008, 'Full Time', 40000, 'BSc in Multimedia');
+INSERT INTO jobs VALUES(2010, 'Data Scientist', 0010, 'Part Time', 35000, 'BSc in Statistics');
+
+-- Insert data into the applications table
+INSERT INTO applications VALUES(3001, 2004, 1005, 'Accepted');
+INSERT INTO applications VALUES(3002, 2004, 1002, 'Pending');
+INSERT INTO applications VALUES(3003, 2001, 1005, 'Rejected');
+INSERT INTO applications VALUES(3004, 2001, 1002, 'Accepted');
+INSERT INTO applications VALUES(3005, 2005, 1003, 'Accepted');
+INSERT INTO applications VALUES(3006, 2003, 1004, 'Pending');
+INSERT INTO applications VALUES(3007, 2002, 1001, 'Accepted');
+INSERT INTO applications VALUES(3008, 2007, 1007, 'Accepted');
+INSERT INTO applications VALUES(3009, 2008, 1008, 'Pending');
+INSERT INTO applications VALUES(3010, 2009, 1009, 'Rejected');
+INSERT INTO applications VALUES(3011, 2010, 1010, 'Accepted');
+INSERT INTO applications VALUES(3012, 2006, 1006, 'Rejected');
+
+--Displaying table data using SELECT command
+select * from companies where category = 'Multinational Technology';
+
+--Displaying table data using subquery
+select * from companies where company_id = (select company_id from jobs where job_id = 2006);
+
+--Updating the data in a table
+update jobs set job_title = 'Informatics Engineer' where job_id = 2008;
+
+--Deleting row from a table
+INSERT INTO jobs VALUES(2011, 'Data Scientist', 0010, 'Full Time', 25000, 'BSc in CSE');
+delete from jobs where job_id = 2011;
+
+--union, intersect, and except
+select company_name from companies where company_name like 'S%' union select company_name from companies where company_name like '%o%';
+select company_name from companies where company_name like 'S%' INTERSECT select company_name from companies where company_name like '%o%';
+select company_name from companies where company_name like 'S%' EXCEPT select company_name from companies where company_name like '%o%';
+
+--With clause
+with max_salary(val) as (select max(salary) from jobs)
+select * from jobs, max_salary where jobs.salary = max_salary.val;
+
+--Aggregate function
+--count how many row exist
+select count(*) from companies;
+--give alias name to any output in select command
+select count(category) as number_of_categories from companies;
+--count distinct
+select count(distinct category) as number_of_categories from companies;
+--count average and total
+select avg(salary) from jobs;
+select sum(salary) from jobs;
+--find max and min
+select max(salary) from jobs;
+select min(salary) from jobs;
+
+--Group by and Having
+select job_type, avg(salary) from jobs group by job_type;
+select job_type, avg(salary) from jobs group by job_type having avg(salary) > 18000;
+
+--Nested subquery
+ select company_name from companies where company_id =
+ (select company_id from jobs where job_id =
+ (select job_id from applications where app_id = 3003));
+
+ --Set Membership (AND, OR, NOT)
+select * from companies where category = 'Multinational Technology' and company_id in (select company_id from jobs where education like '%CSE%');
+select * from jobs where salary > some(select salary from jobs where salary >= 20000);
+select * from jobs where salary > all(select salary from jobs where salary >= 20000);
+select * from jobs where salary >= 20000 and exists(select * from companies where category like '%Multinational Technology%');
+
+--String operations
+--beginning with H
+SELECT * FROM jobs where education like 'H%';
+--ending with e
+SELECT * FROM jobs where education like '%E';
+--contains c & E
+SELECT * FROM jobs where education like '%C%E%';
+--character length 3
+SELECT * FROM jobs where education like '___';
+--character length 3 or 10
+SELECT * FROM jobs where education like '___' or education like '__________';
+
+--Join operations
+--natural JOIN
+select * from companies natural join jobs where company_id = 0001;
+select * from companies natural join jobs;
+--join using
+select company_name, job_title from companies join jobs using(company_id);
+--on and relation
+select company_name, job_title from companies join jobs on companies.company_id = jobs.company_id;
+--left outer join
+select company_name, job_title from companies left outer join jobs using(company_id);
+select company_name, job_title from companies left outer join jobs on companies.company_id = jobs.company_id;
+--right outer join
+select company_name, job_title from companies right outer join jobs using(company_id);
+--full outer join
+select company_name, job_title from companies full outer join jobs using(company_id);
+
+--Views
+drop VIEW custom;
+drop VIEW company_details;
+drop VIEW Apple_Jobs;
+--without other ATTRIBUTES
+create view company_details as select company_id, company_name from companies;
+SELECT * from company_details;
+--as a combination
+create view Apple_Jobs as select job_title from jobs where company_id = (select company_id from companies where company_name = 'Apple');
+SELECT * from Apple_Jobs;
+--Using Other Views
+create view custom as select * from company_details where company_id >= 0006;
+SELECT * from custom;

1907031_PL-SQL.sql

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+--PL/SQL variable declaration and print value
+set serveroutput on
+declare 
+job_id jobs.job_id%type;
+job_title jobs.job_title%type;
+salary number;
+begin
+select job_id, job_title, salary into job_id, job_title, salary from jobs where job_id = 2007;
+dbms_output.put_line('job_id: '||job_id|| ' job_title: '||job_title || ' salary: '||salary);
+end;
+/
+
+--Insert and set default value
+set serveroutput on
+declare 
+app_id applications.app_id%type := 3013;
+job_id applications.job_id%type := 2007;
+user_id applications.user_id%type := 1008;
+status applications.status%type := 'Pending';
+begin
+insert into applications values(app_id,job_id,user_id,status);
+end;
+/
+
+--Row type
+set serveroutput on
+declare 
+job_row jobs%rowtype;
+begin
+select job_id, job_title, salary into job_row.job_id, job_row.job_title, job_row.salary from jobs where job_id = 2007;
+dbms_output.put_line('job_id: '||job_row.job_id|| ' job_title: '||job_row.job_title || ' salary: '||job_row.salary);
+end;
+/
+
+--Cursor and row count
+set serveroutput on
+declare 
+cursor job_cursor is select * from jobs;
+job_row jobs%rowtype;
+begin
+open job_cursor;
+fetch job_cursor into job_row.job_id, job_row.job_title, job_row.company_id, job_row.job_type, job_row.salary, job_row.education;
+while job_cursor%found loop
+dbms_output.put_line('job_id: '||job_row.job_id|| ' job_title: '||job_row.job_title || ' company_id: ' ||job_row.company_id|| ' job_type: ' ||job_row.job_type || ' salary: ' ||job_row.salary || ' education: ' ||job_row.education);
+dbms_output.put_line('Row count: '|| job_cursor%rowcount);
+fetch job_cursor into job_row.job_id,job_row.job_title,job_row.company_id,job_row.job_type,job_row.salary, job_row.education;
+end loop;
+close job_cursor;
+end;
+/
+
+--FOR LOOP/WHILE LOOP/ARRAY with extend() function
+set serveroutput on
+declare 
+  counter number;
+  job_title2 jobs.job_title%type;
+  TYPE TITLEARRAY IS VARRAY(10) OF jobs.job_title%type; 
+  TITLE TITLEARRAY:=TITLEARRAY();
+begin
+  counter:=1;
+  for x in 2001..2010  
+  loop
+    select job_title into job_title2 from jobs where job_id=x;
+    TITLE.EXTEND();
+    TITLE(counter):=job_title2;
+    counter:=counter+1;
+  end loop;
+  counter:=1;
+  WHILE counter<=TITLE.COUNT 
+    LOOP 
+    DBMS_OUTPUT.PUT_LINE(TITLE(counter)); 
+    counter:=counter+1;
+  END LOOP;
+end;
+/
+
+--ARRAY without extend() function
+DECLARE 
+   counter NUMBER := 1;
+   job_title2 jobs.job_title%TYPE;
+   TYPE TITLEARRAY IS VARRAY(10) OF jobs.job_title%TYPE;
+   TITLE TITLEARRAY:=TITLEARRAY('job 1', 'job 2', 'job 3', 'job 4', 'job 5', 'job 6', 'job 7', 'job 8', 'job 9', 'job 10'); 
+BEGIN
+   counter := 1;
+   FOR x IN 2001..2010  
+   LOOP
+      SELECT job_title INTO job_title2 FROM jobs WHERE job_id=x;
+      TITLE(counter) := job_title2;
+      counter := counter + 1;
+   END LOOP;
+   counter := 1;
+   WHILE counter <= TITLE.COUNT 
+   LOOP 
+      DBMS_OUTPUT.PUT_LINE(TITLE(counter)); 
+      counter := counter + 1;
+   END LOOP;
+END;
+
+--IF /ELSEIF /ELSE
+DECLARE 
+   counter NUMBER := 1;
+   job_title2 jobs.job_title%TYPE;
+   TYPE TITLEARRAY IS VARRAY(10) OF jobs.job_title%TYPE;
+   TITLE TITLEARRAY:=TITLEARRAY('job 1', 'job 2', 'job 3', 'job 4', 'job 5', 'job 6', 'job 7', 'job 8', 'job 9', 'job 10'); 
+BEGIN
+   counter := 1;
+   FOR x IN 2001..2010  
+   LOOP
+      SELECT job_title INTO job_title2 FROM jobs WHERE job_id=x;
+      if job_title2 = 'Software Developer' 
+        then
+        dbms_output.put_line(job_title2||' is a '||'CSE or SWE Job');
+      elsif job_title2='Chip Designer'  
+        then
+        dbms_output.put_line(job_title2||' is a '||'EEE job');
+      else 
+        dbms_output.put_line(job_title2||' is a '||'other job');
+        end if;
+   END LOOP;
+END;
+
+--Procedure
+CREATE OR REPLACE PROCEDURE proc(
+  var1 IN NUMBER,
+  var2 OUT VARCHAR2,
+  var3 IN OUT NUMBER
+)
+AS
+  t_show CHAR(30);
+BEGIN
+  t_show := 'From procedure: ';
+  SELECT job_title INTO var2 FROM jobs WHERE job_id IN (SELECT job_id FROM applications WHERE app_id = var1);
+  var3 := var1 + 1; 
+  DBMS_OUTPUT.PUT_LINE(t_show || var2 || ' code is ' || var1 || ' In out parameter: ' || var3);
+END;
+/
+--main
+set serveroutput on
+declare 
+app_id applications.app_id%type := 3001;
+job_title jobs.job_title%type;
+extra number;
+begin
+proc(app_id, job_title, extra);
+end;
+/
+
+--Function
+set serveroutput on
+create or replace function fun(var1 in varchar) return varchar AS
+value jobs.job_title%type;
+begin
+  select job_title into value from jobs where job_id = var1; 
+   return value;
+end;
+/
+--main
+set serveroutput on
+declare 
+value varchar(20);
+begin
+value := fun(2001);
+dbms_output.put_line('function returns ' || value);
+end;
+/
+
+--drop procedure and function
+drop procedure proc;
+drop function fun;

README.md

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+# Database Project of Roll No - 1907031
+- ### Project Name: Online Job Portal Management <br>
+- ### Student Name: Naimur Rahman <br>
+- ### Roll No: 1907031 <br>
+- ### Group: A2 <br>
+- ### Year: 3rd <br>
+- ### Semester: 1st <br>
+
+# Schema Design
+![Schema Design](Images/Schema-design.jpg)