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Understand How Data is Stored in Tables

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. Field

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Understand How Data is Stored in Tables

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  1. Understand How Data is Stored in Tables LESSON 1.1 98-364 Database Administration Fundamentals

  2. Lesson Overview 1.1 Understand how data is stored in tables. • In this lesson, you will review: • Field • Column • Row • Record • Table • Variable

  3. 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

  4. 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).

  5. 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).

  6. 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.

  7. 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.

  8. 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.

  9. Notes Review–Student Project

  10. Assignment • Create a table/database that holds all the records of your report card.

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