1. Creating and Managing Database Tables
ICT Database Lesson 3
Creating and Managing Database Tables

2. Inserting Records Adding information to a set of database fields
Manually enter in Datasheet View or Form – small amounts of data
Import data for a large number of records
Usually a spreadsheet, another database, or as a text file (.txt, .csv)
Map corresponding fields

3. Exporting Records Preparing data to be used in another application
Run a query to create a table with the appropriate information
Export function as (.txt, .csv, or .xlsx)

4. Updating Records
Updating or modifying information in an existing set of fields
Datasheet View for limited amounts of data
SQL routine for larger sets of data

5. Deleting Records Information is permanently deleted from the database
Datasheet View for small amounts of data
SQL routine for larger amounts of data
Must make sure to delete all related material in related tables
May impact other database objects

6. Database Schema
The skeleton structure that represents the logical view of the entire database.
Lists:
The tables to be used in the database
each of the fields to be included in each of the tables
the data type of each of the fields
and the relationship among the various tables.
It also includes all the constraints that are to be applied on the data.

7. Database Schema 1 8

8. Datasheet View
Displays fields in a table similar to how it would look in a spreadsheet
Rows and columns
Columns are fields
Rows are records
Can add or edit fields
Can add, modify or delete records

9. Design View Displays and edit table and field properties Data type
Default value
Required

10. Query
A question that you ask a database using a set of criteria and in return the database provides its answer Returns information in the form of a new table Will display only the particular fields and records from a database you want to see Data returned by a query can come from tables, other queries or reports Automatically create a join between Primary and Foreign Key

11. Query Example
List all pool companies that have purchased BN-0609-TGOLD bullnose and what is my price?

12. Types of Queries: Select
The simplest type of query and most common
Used to select and display data from either a single table or a group of tables depending on what information is wanted
It creates a "virtual" table where the data is displayed and kept. The data in a virtual table can only be changed 1 record at a time

13. Types of Queries: Action
Creates a specific action to be performed on the database
Examples: creating new tables, deleting rows from existing ones and updating records or creating entirely new ones.
Popular query to run because they allow for many records to be changed at one time
Five kinds of action queries are:
Insert Query – adds data to an existing table
Append Query – takes the set results of a query and "appends" (or adds) them to an existing table
Delete Query – deletes records from the table based on the results of the query
Make Table Query (Create) – creates a table based on the results of a query
Update Query – allows for one or more fields in a table to be updated