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For example, this error will occur if you attempt to append a text field to an integer field and the text field contains either alphabetic characters or a number string that is too large for the integer field You might also encounter a conversion error in an update query if you use a formula that attempts a calculation on a field that contains characters For information on data conversions and potential limitations, see Table 5-3 on page 156 This type of error can occur when you run a delete query or an update query on a table that you share with other users on a network Access cannot update records that are in the process of being updated by some other user You might want to wait and try again later when no one else is using the affected records to be sure that your update or deletion occurs.

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Even if you re not sharing the data on a network, you can encounter this error if you have a form or another query open on the data you re updating and have started to change some of the data If any of the rows being inserted or any row being updated violates either a field validation rule or the table validation rule, Access notifies you of an error and does not insert or update any of the rows that fail the validation test..

The FindLastRow function can also be used in the event associated with the Last button to update the LastRow variable as well as set the value for the RowNumber control.

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Modifying Data with Action Queries When you have a referential integrity rule defined, you cannot update or delete a row in a way that would violate the rule. Another problem that can occur, although it isn t an error, is that Access truncates data that is being appended to text or memo fields if the data does not fit. Access does not warn you when this happens. You must be sure (especially with append queries) that the receiving text and memo fields have been defined large enough to store the incoming data.

Earlier in this chapter, you learned how to create an append query to copy old contact events to an archive table. What do you suppose would happen if you copied rows through December 31, 2002, forgot to delete them from the main table, and then later asked to copy rows through April 30, 2003 If you try this starting with an empty archive table in the ContactsDataCopy.mdb database, run qxmplArchiveContactEvents once and then run it again with the same or later cut-off month, you ll get an error dialog box similar to the one shown in Figure 9-30.

Private Sub CommandButton4_Click() LastRow = FindLastRow - 1

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To solve this problem, you can change the select part of the query to choose only the rows that haven t already been inserted into the target table. Remember from the previous chapter the technique you used to find unmatched rows. You ll apply that same technique to solve this problem. Open the query you built in the previous section (or qxmplArchiveContactEvents) in Design view. Add tblContactEventsHistory (the target table) to your query. Create join lines from the ContactID field in tblContactEvents to the same field in tblContactEventHistory. Do the same with ContactDateTime. Double-click each join line to open the Join Properties dialog box and choose the option to include all rows from tblContactEvents and the matching rows from tblContactEventsHistory. You must do this for each join line so that you end up with 361

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RowNumber.Text = FormatNumber(LastRow, 0)

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The dialog box in Figure 9-30 declares that 23 records won t be inserted because of duplicate primary key values. Access didn t find any data conversion errors, locking problems, or validation rule errors. Note that if some fields have data conversion problems, Access might still append the row but leave the field set to Null. When you see this dialog box, you can click the Yes button to proceed with the changes that Access can make without errors. You might find it difficult later, however, to track down all the records that were not updated successfully. Click the No button to cancel the append query.

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