Day 20: Access Chapters 5, 6, 7
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description
Day 20: Access Chapters 5, 6, 7. Larry Reaves [email protected] October 28, 2013. Last class. Reports Design View Layout View Report View Print Preview Report Wizard Labels. Data Validation. Data validation is a set of properties that controls how data is entered into a field - PowerPoint PPT Presentation
Transcript of Day 20: Access Chapters 5, 6, 7
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LAST CLASS
• Reports– Design View– Layout View– Report View– Print Preview
• Report Wizard• Labels
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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
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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.
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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
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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
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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.”
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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
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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
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SELECT
• A SELECT statement is used to retrieve data from the tables in a database
• Four main keywords– SELECT– FROM– WHERE– ORDER BY
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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
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NEXT CLASS
• Access Exam Review Project
