Database Assignment Help | Database Homework Help

A database is a collection of information that is organized in such a manner that it can easily be accessed, managed, and updated. In short, databases can be classified according to types of content: full-text, bibliographic, images and numeric. In computing, databases are sometimes classified according to their organizational approach. The most prevalent one is the relational database. It is a tabular formed database in which one can easily access the data in various ways and recognize the same. A distributed database can be isolated or replicated between different points in a single network. An object-oriented programming database matches with the data defined in the object of classes and its subclasses.

Traditional databases are organized by records, fields, and files. A field is just one small piece of information; a record is one set of fields, and a file is a collection of plenty of records. The collection of programs enables one to organize, enter, and select data in a database. To access this information from a database, one needs a database management system, better known as DBMS.

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What does the database include?

Computer databases usually include aggregations of data records or files, such as product catalogues and inventories, sales transactions and customer profiles. Typically, a database manager provides the users with the ability to control specifying report generation, read/write access and analyzing usage. Database managers and databases are established in large processor systems but are also can be seen in smaller distributed workstations and mid-range systems. SQL, better known as Structured Query Language, is a usual language for making interactive queries from and updating a database such as Microsoft's SQL Server, IBM's DB2, and database products from Sybase, Oracle, and Computer Associates.

Apart from this, there are four types of databases. Flat Model has the least amount of appropriate structure. It looks like one big table in which data in rows are related to one other and columns displays the similar value. The hierarchical model is where the data is organized in a tree-like arrangement. Network Database model is also called many relationship models for this model holds many records that are connected directly to one parent file. And the last one is, Relational Database, also called one to one relationship model. It is the most widely used model where information is presented in the form of a table having related rows and columns.

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A database application is a computer program whose fundamental function is entering and recovering information from a computerized database. Early examples of database applications were accounting systems and airline reservation systems, such as SABRE. An activist, strategist, organizer, teacher, and scholar will find a lot of uses for the database.

Database software is generally easy to use. So the end users can store the data, evaluate it, edit it or delete it. The capture and analysis of data are normally performed by DBMS (Database Management Systems). These types of database software systems are generally programmed in SQL, and examples include MySQL, Microsoft SQL Server, FoxPro and Oracle SAP HANA.

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Database TOPICS
Data models Entity-relationship	Query optimization algorithms
SQL and QBE	Oracle Database
Database Designing	Big Data Hadoop
Data Mining	Query processing
Relational Database	Network database model
Flat Model	E-R diagram
Client-Server architecture	Relational Operations
Crash recovery	Normalisation
SQL and Application code	Normal forms including 1NF, 2NF and 3NF
Transaction Processing Recovery and concurrency control	Object-oriented and object-relational databases,
Logical databases	Web databases
Distributed databases	Data warehousing

 

Database Assignment Help - Sample Solution

Problem - Using the Colonial database, create the following Stored Procedure - CreateDynamicTripAd

Part 1

• This procedure will take in a Trip Id as a parameter and perform the following:
• It will return a resultset with the following info - Trip Id, Trip Name, Season, Average Reservation Price, Number of Reservations, Most positive review note

Part 2 - Reviews are stored in a table called Trip reviews. The table contains the columns

• Trip Id, rating from 1 to 5, date of the review and a review Note.
• Assuming all columns are filled with data.

The procedure will also update a new table named TripAds which keeps track of the ad count generated for this trip, the trip Id and the last time it was updated.

Solution

Part 1 - Instructions

CREATE PROCEDURE DynamicTripAd(IN TripIID Decimal(3,0))

BEGIN

SELECT *

FROM Trip INNER JOIN Reservation ON Reservation.ReservationID=Trip.ReservationID

WHERE Trip.TripId = TripIID,

Select Avg(Reservation.TripPrice) from Trip,

Select count(Reservation.ReservationID) from Trip,

Select Max(Trip. MaxGrpSize) from Trip;

END //

DELIMITER ;

CALL DynamicTripAd(11);


Part 2 - Instructions



CREATE TABLE TripReviews

(

TripID DECIMAL(3,0),

rating number,

reviewnote char(20),

dateofreview date);

CREATE TABLE Trip

(TripID DECIMAL(3,0) PRIMARY KEY,

adcount CHAR(75),

dateofgeneration date);

CREATE TRIGGER NextTRIP

BEFORE/AFTER INSERT, UPDATE, DELETE

ON TripReview

FOR EACH ROW

BEGIN

  IF INSERTING

     INSERT INTO TripAds

     VALUES (:new.Tripid, :new.adCount, :new.dateofgeneration)

  IF UPDATING

     UPDATE TripAds

        SET Tripid = :new.Tripid, adCount = :new.adCount,

        dateofgeneration = :new. dateofgeneration

      WHERE Tripid = :old. Tripid;

      DELETE FROM TripAds WHERE key_column = :old.key_column ;

      INSERT INTO TripAds VALUES  (same as when INSERTING)

  IF DELETING

     DELETE FROM TripAds WHERE dateofgeneration = :old. dateofgeneration;

END;

Code

-- phpMyAdmin SQL Dump
-- version 4.7.0
-- https://www.phpmyadmin.net/
--
-- Host: 127.0.0.1
-- Generation Time: Mar 08, 2019 at 02:57 AM
-- Server version: 10.1.25-MariaDB
-- PHP Version: 5.6.31

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- Database: `procedure`
--

-- --------------------------------------------------------

--
-- Table structure for table `reservation`
--

CREATE TABLE `reservation` (
  `ReservationID` char(7) NOT NULL,
  `TripID` decimal(3,0) DEFAULT NULL,
  `TripDate` date DEFAULT NULL,
  `NumPersons` decimal(3,0) DEFAULT NULL,
  `TripPrice` decimal(6,2) DEFAULT NULL,
  `OtherFees` decimal(6,2) DEFAULT NULL,
  `CustomerNum` char(4) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `reservation`
--

INSERT INTO `reservation` (`ReservationID`, `TripID`, `TripDate`, `NumPersons`, `TripPrice`, `OtherFees`, `CustomerNum`) VALUES
('1600001', '40', '0000-00-00', '2', '55.00', '0.00', '101'),
('1600002', '21', '0000-00-00', '2', '95.00', '0.00', '101'),
('1600003', '28', '0000-00-00', '1', '35.00', '0.00', '103'),
('1600004', '26', '0000-00-00', '4', '45.00', '15.00', '104'),
('1600005', '39', '0000-00-00', '5', '55.00', '0.00', '105'),
('1600006', '32', '0000-00-00', '1', '80.00', '20.00', '106'),
('1600007', '22', '0000-00-00', '8', '75.00', '10.00', '107'),
('1600008', '28', '0000-00-00', '2', '35.00', '0.00', '108'),
('1600009', '38', '0000-00-00', '2', '90.00', '40.00', '109'),
('1600010', '2', '0000-00-00', '3', '25.00', '0.00', '102'),
('1600011', '3', '0000-00-00', '3', '25.00', '0.00', '102'),
('1600012', '1', '0000-00-00', '4', '15.00', '0.00', '115'),
('1600013', '8', '0000-00-00', '1', '20.00', '5.00', '116'),
('1600014', '12', '0000-00-00', '2', '40.00', '5.00', '119'),
('1600015', '10', '0000-00-00', '1', '20.00', '0.00', '120'),
('1600016', '11', '0000-00-00', '6', '75.00', '15.00', '121'),
('1600017', '39', '0000-00-00', '3', '20.00', '5.00', '122'),
('1600018', '38', '0000-00-00', '4', '85.00', '15.00', '126'),
('1600019', '25', '0000-00-00', '2', '110.00', '25.00', '124'),
('1600020', '28', '0000-00-00', '2', '35.00', '10.00', '124'),
('1600021', '32', '0000-00-00', '3', '90.00', '20.00', '112'),
('1600022', '21', '0000-00-00', '1', '95.00', '25.00', '119'),
('1600024', '38', '0000-00-00', '1', '70.00', '30.00', '121'),
('1600025', '38', '0000-00-00', '2', '70.00', '45.00', '125'),
('1600026', '12', '0000-00-00', '2', '40.00', '0.00', '126'),
('1600029', '4', '0000-00-00', '4', '105.00', '25.00', '120'),
('1600030', '15', '0000-00-00', '6', '60.00', '15.00', '104');

-- --------------------------------------------------------

--
-- Table structure for table `trip`
--

CREATE TABLE `trip` (
  `TripID` decimal(3,0) NOT NULL,
  `TripName` char(75) DEFAULT NULL,
  `StartLocation` char(50) DEFAULT NULL,
  `State` char(2) DEFAULT NULL,
  `Distance` decimal(4,0) DEFAULT NULL,
  `MaxGrpSize` decimal(4,0) DEFAULT NULL,
  `Type` char(20) DEFAULT NULL,
  `Season` char(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `trip`
--

INSERT INTO `trip` (`TripID`, `TripName`, `StartLocation`, `State`, `Distance`, `MaxGrpSize`, `Type`, `Season`) VALUES
('1', 'Arethusa Falls', 'Harts Location', 'NH', '5', '10', 'Hiking', 'Summer'),
('2', 'Mt Ascutney - North Peak', 'Weathersfield', 'VT', '5', '6', 'Hiking', 'Late Spring'),
('3', 'Mt Ascutney - West Peak', 'Weathersfield', 'VT', '6', '10', 'Hiking', 'Early Fall'),
('4', 'Bradbury Mountain Ride', 'Lewiston-Auburn', 'ME', '25', '8', 'Biking', 'Early Fall'),
('5', 'Baldpate Mountain', 'North Newry', 'ME', '6', '10', 'Hiking', 'Late Spring'),
('6', 'Blueberry Mountain', 'Batchelders Grant', 'ME', '8', '8', 'Hiking', 'Early Fall'),
('7', 'Bloomfield - Maidstone', 'Bloomfield', 'CT', '10', '6', 'Paddling', 'Late Spring'),
('8', 'Black Pond', 'Lincoln', 'NH', '8', '12', 'Hiking', 'Summer'),
('9', 'Big Rock Cave', 'Tamworth', 'NH', '6', '10', 'Hiking', 'Summer'),
('10', 'Mt. Cardigan - Firescrew', 'Orange', 'NH', '7', '8', 'Hiking', 'Summer'),
('11', 'Chocorua Lake Tour', 'Tamworth', 'NH', '12', '15', 'Paddling', 'Summer'),
('12', 'Cadillac Mountain Ride', 'Bar Harbor', 'ME', '8', '16', 'Biking', 'Early Fall'),
('13', 'Cadillac Mountain', 'Bar Harbor', 'ME', '7', '8', 'Hiking', 'Late Spring'),
('14', 'Cannon Mtn', 'Franconia', 'NH', '6', '6', 'Hiking', 'Early Fall'),
('15', 'Crawford Path Presidentials Hike', 'Crawford Notch', 'NH', '16', '4', 'Hiking', 'Summer'),
('16', 'Cherry Pond', 'Whitefield', 'NH', '6', '16', 'Hiking', 'Spring'),
('17', 'Huguenot Head Hike', 'Bar Harbor', 'ME', '5', '10', 'Hiking', 'Early Fall'),
('18', 'Low Bald Spot Hike', 'Pinkam Notch', 'NH', '8', '6', 'Hiking', 'Early Fall'),
('19', 'Mason?s Farm', 'North Stratford', 'CT', '12', '7', 'Paddling', 'Late Spring'),
('20', 'Lake Mephremagog Tour', 'Newport', 'VT', '8', '15', 'Paddling', 'Late Spring'),
('21', 'Long Pond', 'Rutland', 'MA', '8', '12', 'Hiking', 'Summer'),
('22', 'Long Pond Tour', 'Greenville', 'ME', '12', '10', 'Paddling', 'Summer'),
('23', 'Lower Pond Tour', 'Poland', 'ME', '8', '15', 'Paddling', 'Late Spring'),
('24', 'Mt Adams', 'Randolph', 'NH', '9', '6', 'Hiking', 'Summer'),
('25', 'Mount Battie Ride', 'Camden', 'ME', '20', '8', 'Biking', 'Early Fall'),
('26', 'Mount Cardigan Hike', 'Cardigan', 'NH', '4', '16', 'Hiking', 'Late Fall'),
('27', 'Mt. Chocorua', 'Albany', 'NH', '6', '10', 'Hiking', 'Spring'),
('28', 'Mount Garfield Hike', 'Woodstock', 'NH', '5', '10', 'Hiking', 'Early Fall'),
('29', 'Metacomet-Monadnock Trail Hike', 'Pelham', 'MA', '10', '12', 'Hiking', 'Late Spring'),
('30', 'McLennan Reservation Hike', 'Tyringham', 'MA', '6', '16', 'Hiking', 'Summer'),
('31', 'Missisquoi River - VT', 'Lowell', 'VT', '12', '10', 'Paddling', 'Summer'),
('32', 'Northern Forest Canoe Trail', 'Stark', 'NH', '15', '10', 'Paddling', 'Summer'),
('33', 'Park Loop Ride', 'Mount Desert Island', 'ME', '27', '8', 'Biking', 'Late Spring'),
('34', 'Pontook Reservoir Tour', 'Dummer', 'NH', '15', '14', 'Paddling', 'Late Spring'),
('35', 'Pisgah State Park Ride', 'Northborough', 'NH', '12', '10', 'Biking', 'Summer'),
('36', 'Pondicherry Trail Ride', 'White Mountains', 'NH', '15', '16', 'Biking', 'Late Spring'),
('37', 'Seal Beach Harbor', 'Bar Harbor', 'ME', '5', '16', 'Hiking', 'Early Spring'),
('38', 'Sawyer River Ride', 'Mount Carrigain', 'NH', '10', '18', 'Biking', 'Early Fall'),
('39', 'Welch and Dickey Mountains Hike', 'Thorton', 'NH', '5', '10', 'Hiking', 'Summer'),
('40', 'Wachusett Mountain', 'Princeton', 'MA', '8', '8', 'Hiking', 'Early Spring'),
('41', 'Westfield River Loop', 'Fort Fairfield', 'ME', '20', '10', 'Biking', 'Late Spring');

--
-- Indexes for dumped tables
--

--
-- Indexes for table `reservation`
--
ALTER TABLE `reservation`
  ADD PRIMARY KEY (`ReservationID`),
  ADD KEY `cons1` (`TripID`);

--
-- Indexes for table `trip`
--
ALTER TABLE `trip`
  ADD PRIMARY KEY (`TripID`);

--
-- Constraints for dumped tables
--

--
-- Constraints for table `reservation`
--
ALTER TABLE `reservation`
  ADD CONSTRAINT `cons1` FOREIGN KEY (`TripID`) REFERENCES `trip` (`TripID`);
COMMIT;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;