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Relational Database Example in

Access - Order System

Please use speaker notes for

additional information!

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The inventory table (inven) contains all information directly related to the

items we carry. The primary key is itemno and all elements of the table relate

directly to itemno. The department table (department) was created because it

would not meet the rules of third normal form to carry the department nameand manager on the inven table because they relate to the department number

rather than to the itemno.

The customer table (invcust) carries all information related to the customer.

The primary key is custid. We could not carry the information about the sales

representatives such as name and commission rate on this table because they

relate to the sales representative number not to the custid. Therefore wecreated a new sales representative table (salesrep).

Orders have header information that applies to the whole order and line item

information that applies to the particular item that is being ordered. The

relationship between the order header and the order line items is a one to many

relationship. One order has many line items but each line item belongs to one

order. Therefore this system has an order header table (orderz) that containsinformation about the order such as order number, customer number and the

date of the order. It also has an order line item table (ordline) that contains

the order number, the item number of the item being ordered and the number

ordered. Because of the one to many relationship this table has a primary key

consisting of the order number and the item number.

Table design

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Table: inven

The ItemNo is the primary

key for this table.

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Table: invcust

The Custid is theprimary key for this

table.

Notice Indexed is Yes with

no duplicates.

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There is a one to many relationship between the order header table (orderz) and

the order line item table (ordline). This means for every order there can be

multiple line items, but for each line item there is only one order. I can find out

the line items by going into the ordline table and retrieving all records that

match the order number for a given order. Because there are multiple line

items with the same order number, I have to use the combination or ordernumber and item number to make a unique primary key.

Tables: orderz &

ordlineOrdno

is the

primary

key.

Ordno and Itemno

are the primary

keys.

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The primary key

is Slsrep.

Tables: Salesrep

& Department

The primary key is

Dept.

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Query: Inven & DepartmentSELECT Inven.ItemNo, Inven.ItemName, Inven.Dept, Department.Deptname,

Department.Manager

FROM Department INNER JOIN Inven ON Department.Dept = Inven.Dept;

SELECT ItemNo, ItemName, Inven.Dept, Deptname, ManagerFROM Inven, Department

WHERE Department.Dept = Inven.Dept;

Access SQL code.

My SQL code.

From

inven. From

department.

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Queries: Orderz & Invcust

SELECT Orderz.Ordno, Orderz.Custid, Invcust.Custname, Orderz.Ordate

FROM Invcust INNER JOIN Orderz ON Invcust.Custid = Orderz.Custid;

SELECT Ordno, Orderz.Custid, Custname, Ordate

FROM Orderz, InvCust

WHERE Invcust.Custid = Orderz.Custid;

Access SQL code

My SQL code

Custname from

Invcust table - the rest

from Orderz table.

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SELECT Orderz.Ordno, Orderz.Custid, Orderz.Ordate, Ordline.Itemno,

Ordline.Numord

FROM Orderz INNER JOIN Ordline ON Orderz.Ordno = Ordline.Ordno;

SELECT Orderz.Ordno, Custid, Ordate, Itemno, Numord

FROM Orderz, Ordline

WHERE Orderz.Ordno = Ordline.Ordno;

Query: Orderz & Ordline

Access SQL code

My SQL code

From

Orderz From

ordline

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SELECT Orderz.Ordno, Ordline.Itemno, Inven.ItemName, Ordline.Numord

FROM Inven INNER JOIN (Orderz INNER JOIN Ordline ON

Orderz.Ordno = Ordline.Ordno) ON Inven.ItemNo = Ordline.Itemno;

Query: Orderz, Ordline, Inven

SELECT Orderz.Ordno, Ordline.Itemno, Inven.ItemName, Ordline.Numord

FROM Orderz, Ordline, Inven

WHERE Orderz.Ordno = Ordline.Ordno AND Inven.ItemNo = Ordline.Itemno;

Access SQL My SQL

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Query on 4

tables

SELECT Orderz.Ordno, Orderz.Custid, Invcust.Custname, Orderz.Ordate,

Ordline.Itemno, Inven.ItemName, Ordline.Numord

FROM (Invcust INNER JOIN Orderz ON Invcust.Custid = Orderz.Custid) INNER JOIN (Inven

INNER JOIN Ordline ON Inven.ItemNo = Ordline.Itemno) ON Orderz.Ordno = Ordline.Ordno;

SELECT Orderz.Ordno, Orderz.Custid, Custname, Ordate, Ordline.Itemno, ItemName, Numord

FROM Invcust, Orderz, Ordline, Inven

WHERE Invcust.Custid = Orderz.Custid AND Inven.ItemNo = Ordline.Itemno ANDOrderz.Ordno = Ordline.Ordno;

Access

SQL

My

SQL