Download DBAdminFund_PPT_1.1

LESSON
1.1
98-364 Database Administration Fundamentals
Understand How Data is
Stored in Tables
LESSON
1.1
98-364 Database Administration Fundamentals
Lesson Overview
1.1 Understand how data is stored in tables.
In this lesson, you will review:

Field

Column

Row

Record

Table

Variable
LESSON
1.1
98-364 Database Administration Fundamentals

Field
 A location in a record in which a particular type of data is stored.
For example, EMPLOYEE-RECORD might contain fields to
store Last-Name, First-Name, Address, City, State, Zip-Code,
Hire-Date, Current-Salary, Title, Department, and so on.
Individual fields are characterized by their maximum length and
the type of data (for example, alphabetic, numeric, or financial)
that can be placed in them. The facility for creating these
specifications usually is contained in the data definition language
(DDL). In a relational database management system (RDMS),
fields are called columns.
A field is one spot in a table.
A field = data = some value
LESSON
1.1
98-364 Database Administration Fundamentals

Column
 In an RDMS, the name of an attribute. The collection of column
values that form the description of a particular entity is called a
tuple or row. A column is equivalent to a field in a record in a
nonrelational file system.
A column is a group of items that are listed up and down (that is,
vertically).
LESSON
1.1
98-364 Database Administration Fundamentals

Row
A series of items arranged horizontally within some type of
framework—for example, a continuous series of cells running from
left to right in a spreadsheet; a horizontal line of pixels on a video
screen; or a set of data values aligned horizontally in a table.
A row is a group of items that are listed across—left to right (that is,
horizontally).
LESSON
1.1
98-364 Database Administration Fundamentals

Record
 A data structure that is a collection of fields (elements), each with its
own name and type.
A record is a group of fields across one row.
LESSON
1.1
98-364 Database Administration Fundamentals

Table
 In an RDMS, a data structure characterized by rows and columns,
with data occupying or potentially occupying each cell formed by
a row-column intersection. The table is the underlying structure of
a relation.
A table is a group of rows and columns.
LESSON
1.1
98-364 Database Administration Fundamentals

Variable
A variable name is the label that we give to a column.
Note: This is a slightly different definition from what you might
have learned in a programming class. In programming, a variable is
defined as a named storage location capable of containing data that
can be modified during program execution.
LESSON
1.1
98-364 Database Administration Fundamentals
Notes Review–Student Project
Teacher Student
StudentStudent
Grade
Grade
Name
ID
Name
smith
Jones
Johnson
A
Section
Number
field
field
R
field
e
c
o
r
d
LESSON
1.1
98-364 Database Administration Fundamentals
Assignment

Create a table/database that holds all the records of your report
card.