Ms Access Error Handling Query
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Access Query Iferror
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you, helping each other. Join them; it only takes a minute: Sign up MS Access handling #error up vote 1 down vote favorite Sometimes when I have a field that has #Error such as a divide by
Nz() Access
0, is there a way to perform an isError() or something similar? Sometimes it's not always clear when a mistake has been made, which means I have to go back through a bunch of queries to find where some div/0 error has taken place, since usually the errors occur silently. I'd like to be able to explicitly look for #Iserror so I can locate it when it occurs. e.g. SELECT sourcetable.fieldname INTO desttable IN '\\path\database.mdb'FROM sourcetable; ms-access share|improve this question edited Sep 20 '12 at 16:33 asked Jul 19 '12 at 16:52 IAmBatman 157217 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote accepted For division by zero, you should be trapping in a different way ( http://office.microsoft.com/en-us/access-help/avoiding-divide-by-zero-errors-in-access-HA001055073.aspx ) =IIf([Divisor]=0,Null,[Dividend]/[Divisor]) It is not unusual to use IsError with a reference to a subform: =IIf(IsError([Form].[Subform]![SummedControl]),0,[Form].[Subform]![SummedControl]) share|improve this answer edited Jul 19 '12 at 17:10 answered Jul 19 '12 at 17:04 Fionnuala 77.2k665110 Yes, I know I can do that; but there are times when different things result in the same #error and it'd be nice to trap that so I can go back and implement the code correctly. –IAmBatman Jul 19 '12 at 17:06 Not everything that is an error IsError. I will add an example that is. –Fionnuala Jul 19 '12 at 17:08 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged ms-access or ask your own question. asked 4 years ago vi
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Nulls in Criteria If you enter criteria under a field in a query, it returns only matching records. Nulls are excluded when you enter criteria. For example, say you have a table of company names and addresses. You want http://allenbrowne.com/casu-12.html two queries: one that gives you the local companies, and the other that gives you all the rest. In the Criteria row under the City field of the first query, you type: "Springfield" and in the second query: Not "Springfield" Wrong! Neither query includes the records where City is Null. Solution Specify Is Null. For the second query above to meet your design goal of "all the rest", the criteria needs to be: Is Null Or Not ms access "Springfield" Note: Data Definition Language (DDL) queries treat nulls differently. For example, the nulls are counted in this kind of query: ALTER TABLE Table1 ADD CONSTRAINT chk1 CHECK (99 < (SELECT Count(*) FROM Table2 WHERE Table2.State <> 'TX')); Error 2: Nulls in expressions Maths involving a Null usually results in Null. For example, newbies sometimes enter an expression such as this in the ControlSource property of a text box, to display the amount still payable: =[AmountDue] - ms access error [AmountPaid] The trouble is that if nothing has been paid, AmountPaid is Null, and so this text box displays nothing at all. Solution Use the Nz() function to specify a value for Null: = Nz([AmountDue], 0) - Nz([AmountPaid], 0) Error 3: Nulls in Foreign Keys While Access blocks nulls in primary keys, it permits nulls in foreign keys. In most cases, you should explicitly block this possibility to prevent orphaned records. For a typical Invoice table, the line items of the invoice are stored in an InvoiceDetail table, joined to the Invoice table by an InvoiceID. You create a relationship between Invoice.InvoiceID and InvoiceDetail.InvoiceID, with Referential Integrity enforced. It's not enough! Unless you set the Required property of the InvoiceID field to Yes in the InvoiceDetail table, Access permits Nulls. Most often this happens when a user begins adding line items to the subform without first creating the invoice itself in the main form. Since these records don't match any record in the main form, these orphaned records are never displayed again. The user is convinced your program lost them, though they are still there in the table. Solution Always set the Required property of foreign key fields to Yes in table design view, unless you expressly want Nulls in the foreign key. Error 4: Nulls and non-Variants In Visual Basic, the only data type that can contain Null is