microsoft office access 2003

New Perspectives on Microsoft Office Access 2003, Second Edition- Tutorial 5

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Microsoft Office Access 2003

Tutorial 5 – Enhancing a Table’s Design and Creating Advanced Queries


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XPCreate a Lookup Wizard field in a table

• To make a form easier to use, you will often add a Lookup Wizard to the form.

• Instead of remembering a particular value, you can pick the value from a list.

• This approach insures that you cannot enter an invalid value.

• When you create the Lookup Wizard, you will provide a list of acceptable values from which other users will make a selection.


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XPStart the Lookup Wizard process

• To start the Lookup Wizard process:– Start Access and open the database to be modified– Open the desired table in Design view– Find the field you want to modify as a Lookup Wizard– Click on the right side of the Data Type text box for the

field, and then click the Lookup Wizard option– The first Lookup Wizard dialog box will appear


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XPLookup Wizard dialog box 1


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XPA lookup field in Datasheet view


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XPDisplay related table records in a subdatasheet

• You can form a relationship between two tables based on a common field.

• You can display the data from the related table as a subdatasheet in the primary table's datasheet.

• To see the subdatasheet, simply click the expand indicator in the row for which you'd like to see the subdatasheet.


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XPIllustration of a subdatasheet


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XPCreate an input mask for a table field

• Some fields require special characters to make them more readable. A phone number, for example, often includes parentheses and/or dashes. You can create an input mask that will display these characters as a predefined format.

• This predefined format can be used to enter or display data in a field.

• You can set up literal display characters that will automatically appear in a field. When you provide literal display characters, the user will not need to enter those characters.

• The Input Mask Wizard makes it easy for you to create an input mask.


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XPAn input mask for a phone number field


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XPInput Mask character descriptions


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XPDefine data validation criteria

• You may want to view only records that match a particular criteria. You can do this by creating a query that uses a pattern match.

• You can use the like comparison operator using the asterisk (*), the question mark (?), or the number symbol(#). These wildcard characters allow you to create much more flexible patterns.

• You can also create a List of values match by creating a list of valid values and then using the In comparison operator to define a condition with two or more values. The non-matching values select records that do not match the criteria specified.


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XPA design grid with a pattern match field


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XPUse a list of values to expand the selection possibilities


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XPUse both the And and Or logical operators in the same query

• There will be circumstances where you will want to use both the And and Or logical operators in the same query.

• The In operator naturally creates an Or condition. You can also use the key word Or in the criteria row to create an Or condition.

• Placing two conditions on the same row of the Criteria in the Query design grid creates an And condition.

• Placing two conditions on separate rows in the Query design grid creates an Or condition.


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XPSample design grid with And and Or conditions in the same query


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XPThe query result for the combined use of And and Or


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XPCreate a parameter query

• Sometimes when you create a query, you don't know exactly which records the user might want to see.

• To allow flexibility in the query, you can create a parameter query.

• The parameter query will prompt the user to enter the value they want to use to select records.

• Once the user has supplied this information, those records that match the value will be displayed in the query datasheet.


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XPDefining a parameter query


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XPCreating a Crosstab Query

• A crosstab query performs aggregate function calculations on the values of one database field and displays the results in a spreadsheet format.

• An aggregate function performs an arithmetic operation on selected records in a database.

• To access the crosstab query wizard, create a new query and select the Crosstab Query Wizard option from the New Query dialog box.


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XPAggregate Functions


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XPThe Crosstab Query Wizard dialog box 1


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XPThe Crosstab Query Wizard dialog box 2


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XPThe Crosstab query recordset


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XPThe Find Duplicates Query

• The find duplicates query finds duplicate records in a table or query.

• Locating duplicates helps avert potential problems (assigning two different product numbers to the same product).

• To create a Find Duplicates Query, select the Find Duplicates Query Wizard in the New Query dialog box when you create a new query.


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XPThe Find Duplicates Query


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XPThe Find Unmatched Query

• A find unmatched query is a select query that finds all records in a table or query that have no related records in a second table or query.

• You can, for example, find all customers who have not placed an order.

• To create a Find Unmatched Query, select the Find Unmatched Query Wizard in the New Query dialog box when you create a new query.


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XPThe Find Unmatched Query dialog box


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XPThe Top Values Query

• This query allows you to limit the number of records that display as a result of a query.– Top Values property

• Create a query in design view with the necessary fields and sorting. Enter the number of records (or percentage of records) you want selected in the Top Values text box on the Query Design toolbar and then click the Run button.


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XPThe Top Values Query

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