ACCESS CHAPTER 4Tables and Queries

Learning Objectives: Define table structure Enter data into a table Alter table structure Set a table’s field properties Join tables and establish referential integrity Create single table queries Create queries involving multiple tables,

derived column values, and expressions Create queries with an outer join relationship Create parameter queries

ACCESS OBJECTS:

Tables: All database information is stored in tables comprised of rows (attributes) and columns (tuples)

Queries: A question you ask about one or more tables in your database

Forms: A simple way to enter, change, or display data

Reports: A convenient way to consolidate and group information that is stored in a database for publication or reporting purposes.

TASK 1. create a table from scratch and enter data into it Exercise 4.1: creating the ‘Customer Table’ structureExercise 4.2: defining the tableExercise 4.3 & 4.4: populating the ‘Customer Table’Print ‘Customer Table’

TASK 2. alter table structure - adding a column to a tableExercise 4.5: adding a column to the ‘Employee Table’Exercise 4.6: entering values in the EmployeeDivisionID column

TASK 3. establish referential integrityProhibiting removal of a parent table row until all the rows in another table referring to the parent table are first removed in called referential integrity.

Exercise 4.7: establishing referential integrityExercise 4.8: display related tablesAdd all tables to the relationships window; adjust their size and position to have the table titles and contents shown completely as Figure 4.14; print the relationships.

TASK 4. set a table’s field propertiesExercise 4.9: setting field properties for the EmployeeWorkPhone fieldExercise 4.10: setting field properties for the Employee Commission field

TABLES QUERIESTASK 1. create and use a query

Exercise 4.11: creating a one-table queryExercise 4.12: creating a two-table query using a comparison operator Complete Exercise 4 on page 206 and print the resulting dynasetRead ‘Using Logical Operator in Query Criteria’ section on page 192Complete Problem 2 on page 207 and print the resulting dynaset

TASK 2. perform calculations with queriesExercise 4.13: writing expressions in queriesExercise 4.14: using summary functions in a queryExercise 4.15: creating an outer join queryExercise 4.16: creating a parameter queryComplete Problem 3 on page 207 and print the resulting dynasetComplete Problem 4 on page 207 and print the first three pages of the resulting dynaset

ACCESS CHAPTER 4Tables and Queries