DAY 20: ACCESS CHAPTERS 5, 6, 7 Larry Reaves October 28,

LAST CLASS Reports –Design View –Layout View –Report View –Print Preview Report Wizard Labels 2

DATA VALIDATION Data validation is a set of properties that controls how data is entered into a field –Required –Default Value –Validation Rule –Input Mask 3

REQUIRED A required field must have a value when you create a new record. It can not be left blank. By default, required is set to no for all fields except for the primary key. Primary keys are required since they are used to identify the records. 4

DEFAULT VALUE If you have a common value in a field that is used more often than not you can set it as the default value for the field. The default value will automatically be used when you create a new record and leave the field blank. The Date() function can also be used as a default value to use the current date for new records 5

VALIDATION RULE Validation rules restrict the data values that can be entered into a field Examples: >= 7.5 > #01/01/2010# Validation rules do not make the field required 6

VALIDATION TEXT Validation text allows you to specify a message that will be displayed when the validation rule is broken If validation text is not entered the user will see the default message: “One or more values are prohibited by the validation rule ‘rule’ set for ‘TableName.FieldName’. Enter a value that the expression for this field can accept.” 7

INPUT MASK Input masks allow you to restrict the data being input for text and data types to exactly the format you specify Examples: –Phone numbers –Social Security numbers –Zip codes –Dates 8

SQL All queries are handled internally as SQL SQL stands for Structured Query Language You can see and edit the SQL that makes up a query from SQL View 9

SELECT A SELECT statement is used to retrieve data from the tables in a database Four main keywords –SELECT –FROM –WHERE –ORDER BY 10

JOIN TYPES INNER JOIN –Only records where the keys match RIGHT JOIN –All records from the right table and matches from the left LEFT JOIN –All records from the left table and matches from the right 11

NEXT CLASS Access Exam Review Project 12