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To add another field to the existing primary key, select both the old and new key fields, and then click the Primary Key command The key icon appears in the row selector of both rows At times, you might want to disable the primary key temporarily for example, if you re importing records from another table, some of which might contain values that duplicate your original table You must remove any duplicates in the new data before restoring the primary key This has no effect on the data stored in the field designated as the key: it simply removes the key field feature temporarily To remove the primary key designation, select the primary key field and click the Primary Key command If the key is used in a relationship, you must delete the relationship before you can remove the key
Part I:
Getting Started
Modifying or Deleting an Index
To delete a single-field index, change the field s Indexed property to No in the Field Properties pane This removes only the index; it has no effect on the field itself or the underlying data In the Indexes dialog box (on the Design tab s Show/Hide group, click the Indexes command), you can add or delete fields from a multiple-field index, change the sort order for any field in the index, or change the index properties You can also change the field order in the index To remove a field from a multiple-field index, display the Indexes dialog box, select the field row, and then press the del key To remove the entire index, display the Indexes dialog box, select all the rows in the index, and then press the del key To insert an additional field into the index, display the Indexes dialog box and select the field below where you want the new field to appear Then press insert and enter the new field name To change the field order in a multiple-field index, select and drag the field selector to the desired position in the index definition To change the sort order for any of the fields in the index, choose Ascending or Descending from the Sort Order list After making changes to the table s indexes, be sure to save the table Access reminds you to do so if you try to close the table or if you return to Datasheet view without saving
Ensuring Data Validity
You ve seen a few of the ways Access helps you ensure that the values entered in your database are valid The data type you choose for the field can limit the values to, for example, date and time values You can also limit the number of characters in a Text field and prevent duplicate values A direct way to ensure valid data is to set some rules that the values must obey You can specify two kinds of data validation rules: A field validation rule can limit the value to a few specific values or to a range of values The rule is checked when you try to move to another field in the same or another record For example, a rule could limit a numeric value to a range between 1 and 100 or insist a date value fall in 2007 A record validation rule is handy for comparing the values in two fields in the same record The rule is checked when you move out of a record and Access attempts to save the record Access won t save a record with a conflict between fields For example, a record validation rule could prevent saving a record in which the Job Cost is greater than the Bid Price Another record validation rule could ensure that the elapsed time between dates in two separate fields doesn t exceed a specific value
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