#error In Access 2007 Query
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Access 2007 Query Between Two Dates
Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users access 2007 query criteria if null Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a http://www.utteraccess.com/forum/Remove-error-Query-Res-t2005204.html minute: Sign up Access 2007 - Left Join to a query returns #Error instead of Null up vote 0 down vote favorite 1 Similar to this question, but their problem with the query was never fully solved: #Error showing up in multiple LEFT JOIN statement Access query when value should be NULL I get #Error when I'm expecting to see a http://stackoverflow.com/questions/17170426/access-2007-left-join-to-a-query-returns-error-instead-of-null Null when doing a left join where there is no corresponding record on the right hand side of the join: Chain CasesPerMonthPerStore MonthOfFirstOrder Naturally 2.3 5/1/2011 Tom's Market #Error Livingstons #Error EverClear 3.1 7/1/2012 Bob's Market 2.66 5/1/2012 Andy's Exports #Error Jamestowns 0.89 7/1/2012 It works fine if I copy the data into a table and left join to this table, so I assume there is something wrong in the syntax of the query: SELECT MonthRange.Chain, MonthRange.CasesShipped/IIf(MonthsSinceFirstOrder.Months>DateDiff("m",QueryDates.StartDate,QueryDates.EndDate)+1, DateDiff("m",QueryDates.StartDate,QueryDates.EndDate)+1, MonthsSinceFirstOrder.Months)/NumStores.NumberOfStores AS CasesPerMonthPerStore, MonthsSinceFirstOrder.MonthOfFirstOrder FROM QueryDates, ( MonthRange INNER JOIN NumStores ON MonthRange.Chain=NumStores.Chain ) INNER JOIN MonthsSinceFirstOrder ON MonthRange.Chain=MonthsSinceFirstOrder.Chain; This SQL returns the correct results, it's just its behaviour when Left Joining to it that is returning #Errors. nb the strange Iif statement in the middle checks to see if the number of months since the first order is greater than the number of months included in the specified date range - so if the date range has 6 months and the first order was 9 months before the end date, it uses 6; if the first order was only 4 months before the end
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 http://allenbrowne.com/casu-12.html want 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: http://www.pcreview.co.uk/threads/eliminate-error-from-query-results.2192405/ 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 access 2007 Not "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] access 2007 query - [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
the following calculation in my qryinvcalc, and it works fine except that if there is a null value I get an "#Error" within my query results. PercentofTotalM2Shipped: Round([ttlm2Shipped]/[TotalM2Shipped],4) I have search and found some post about using "NZ", I am unsure how to apply that to my equation or what exactly this does? Thanks in advance.. Brook Guest, Oct 18, 2005 #1 Advertisements Ken Snell [MVP] Guest Nz is a VBA function that allows you to use a substitute value for a Null value. In your example, either ttlm2Shipped or TotalM2Shipped could have a Null value. For purposes of display, I'll show you many ways to use the Nz function in this setup. ' replace Null value in numerator with a zero PercentofTotalM2Shipped: Round(Nz([ttlm2Shipped],0) / [TotalM2Shipped],4) ' replace Null value in numerator with a zero and Null value in denominator with a one PercentofTotalM2Shipped: Round(Nz([ttlm2Shipped],0) / Nz([TotalM2Shipped], 1) ,4) ' replace Null value from division result with a zero PercentofTotalM2Shipped: Round(Nz([ttlm2Shipped] / [TotalM2Shipped], 0) ,4) etc. etc. -- Ken Snell